: Add one mana of any color that a land an opponent controls could produce.

The first spell you cast during each of your turns has assist. When you cast that spell, if another player spent mana to cast it, you and that player each draw a card. (As you cast a spell with assist, you may choose another player. They may pay some or all of the generic mana in the spell's cost.)

Grakk can't attack or block.
Whenever you cast an Aura spell that targets a creature an opponent controls, draw a card. This ability triggers only once each turn.

Whenever a face-down creature attacks one of your opponents, it can't be blocked this combat.
: Manifest the top card of your library. Any player may activate this ability but only as a sorcery. (To manifest a card, put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)

Double strike
Start your engines! (If you have no speed, it starts at 1. It increases once on each of your turns when an opponent loses life. Max speed is 4.)
Whenever Tsagan attacks, creatures you control get +1/+0 until end of turn for each creature you control with first strike or double strike.
Max speed — Tsagan has deathtouch. Other creatures you control have first strike.

At the beginning of your upkeep, put a tide counter on Rikala. Then if there are four or more tide counters on Rikala, remove them.
Creatures you control get +1/+0 for each tide counter on Rikala.
Whenever you tap an Island for mana, if there are three or more tide counters on Rikala, add an additional .

(You may cast a legendary sorcery only if you control a legendary creature or planeswalker.)
Discover X, where X is the amount of mana spent to cast this spell. (Exile cards from the top of your library until you exile a nonland card with that mana value or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)
Ashaya's Enduring Bond can be your commander.

If a triggered ability of a permanent you control but don't own triggers, that ability triggers an additional time.

Whenever a creature you control becomes blocked, you may untap it and remove it from combat.
, Sacrifice Nivea: Create an Akroma, Angel of Wrath token. (She's a legendary 6/6 Angel creature with flying, first strike, vigilance, trample, haste, and protection from black and from red.)

Lands you control have ": Add one mana of any color."
: Add one mana of any color.

Rulebreaker — A deck with this commander can have Aura cards of any color identity and any basic land cards.
+1: Add one mana of any color. When you spend this mana to cast an Aura spell this turn, create a 1/1 red Gremlin creature token.
−3: Discard your hand, then draw cards equal to twice the number of Auras you control. For each Aura attached to you, attach it to an opponent of your choice.
The Unluckiest Planeswalker can be your commander.

Shadow (This creature can block or be blocked by only creatures with shadow.)
Whenever a creature you control with shadow deals combat damage to a player, draw a card.
: Put a shadow counter on another target creature. Activate only as a sorcery.

Whenever Massimo or another creature you control enters, exile up to one target instant or sorcery card with mana value 1 from your graveyard. If a card is exiled this way, that creature gains "Whenever this creature deals combat damage to a player, copy the exiled card. You may cast the copy without paying its mana cost."

Flying
If you would create one or more tokens, you may create that many Clue tokens instead. (They're artifacts with ", Sacrifice this token: Draw a card.")

Eminence — At the beginning of your upkeep, Sahir deals 1 damage to you. This ability triggers only if Sahir is in the command zone or on the battlefield.
Whenever a source you control deals exactly 1 damage to you and whenever a spell or ability you control causes you to lose exactly 1 life, put a +1/+1 counter on Sahir. If this is the second time this ability has resolved this turn, draw a card.

Whenever another creature dies, create a Food token. This ability triggers only once each turn. (It's an artifact with ", , Sacrifice this token: You gain 3 life.")
For every seven Foods you control, Squirrels you control get +3/+3.

Rulebreaker — A deck with this commander has no maximum deck size.
, : You draw a card and gain 1 life. This ability costs less to activate if you had 200 or more cards in your starting deck.

Whenever another nontoken Ooze creature you control dies, create two tokens that are copies of that creature, except they're 2/2 and they aren't legendary.

Whenever another Zombie you control enters, put a +1/+1 counter on target Cat you control.
Whenever another Cat you control enters, put a +1/+1 counter on target Zombie you control.
At the beginning of your end step, each opponent loses life equal to the number of tapped Cats and/or Zombies you control.

Landfall — Whenever a land you control enters, any number of target players each mill X cards, where X is twice the number of Crabs, Lobsters, Nautiluses, Starfish, and/or Trilobites you control.

The owner of target permanent shuffles it into their library, then reveals the top card of their library. If it's a permanent card, they put it onto the battlefield.

At the beginning of your upkeep, exile the top three cards of your library. Each opponent secretly chooses a number 0 or greater. Then those numbers are revealed. Choose an opponent with the highest number. Itazura deals that much damage to them, then they may cast a spell from among those cards without paying its mana cost. You put a card from among them that wasn't cast this way into your hand.

0: Create a 1/1 white Cat creature token with ": Put a loyalty counter on each planeswalker you control."
−1: Look at the top six cards of your library. You may reveal a planeswalker or basic Plains card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.
−8: Create ten Scryb Sprites tokens. (They're 1/1 Faerie creatures with flying.)
Worzel, the Protector can be your commander.

Each Beast, Camel, Horse, Elephant, and Wolf creature you control is a Mount in addition to its other types and has saddle 2. (Tap any number of other creatures you control with total power 2 or more: That Mount becomes saddled until end of turn. Saddle only as a sorcery.)
Whenever a saddled creature you control attacks, it gets +2/+2 until end of turn. Draw a card. Create a Food token.

When Nephilim Epochal enters, search your library for a Nephilim card, reveal it, put it into your hand, then shuffle.
Nephilim you control get +1/+1 for each other Nephilim you control and can't be blocked by monocolored creatures.

Shadow (This creature can block or be blocked by only creatures with shadow.)
Attacking Ninjas and Rogues you control have deathtouch.
Whenever one or more Ninjas and/or Rogues you control deal combat damage to a player, create a 1/1 black Rat Rogue creature token.

Other Phyrexians you control get +1/+1.
Each Equipment you control has living weapon. (Whenever an Equipment you control enters, create a 0/0 black Phyrexian Germ creature token, then attach that Equipment to it.)

The first nonlegendary creature spell you cast each turn has demonstrate. (When you cast that spell, you may copy it. If you do, choose an opponent to also copy it. Each copy becomes a token.)

Each other creature you control gets +3/+3 as long as it's not attacking or blocking.
Creature spells you control and creature cards you own in any zone other than the battlefield or the stack get +3/+3.

Whenever a source you control deals damage, if at least one permanent or player was dealt exactly 2 of that damage, exile the top card of your library. You may play it until the end of your next turn.
, , Exile two cards from your graveyard: Matoc deals 2 damage to any other target.

Whenever another creature you control enters, you lose 1 life and add .

Rulebreaker — A deck with this commander can have Phyrexian cards of any color identity and any basic land cards.
Phyrexian creatures you control have menace and lifelink.

Istvan attacks each combat if able.
Prevent all damage that would be dealt to Istvan by creatures.
Whenever a creature an opponent controls dies, put two +1/+1 counters on Istvan.

Vigilance, trample
At the beginning of your end step, each player may create a tapped land token named Sanctum with ": Add one mana of any color." Each opponent who does can't attack you during their next turn.

Whenever you discard one or more cards at random, select one or more targets at random, choose one or more modes at random, flip one or more coins, or roll one or more dice, put a +1/+1 counter on Chira and create a tapped Treasure token.

Menace
Whenever Miss Highwater deals combat damage to a player who doesn't have a contract counter, they may discard their hand. If they do, they draw seven cards and get a contract counter. For as long as they have a contract counter, when they lose the game, for each artifact and creature they controlled, create a token that's a copy of it.