Whenever you tap a nonland permanent for mana, add one mana of any type that permanent produced.
: Look at the top five cards of your library. You may put a non-Human creature card from among them onto the battlefield. Put the rest on the bottom of your library in a random order.

Until end of turn, creatures you control gain menace and "Whenever this creature deals combat damage to a player, exile the top card of that player's library face down. You may look at and play that card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast that spell."

Dragon spells you cast cost less to cast.

, : Add .

Reach
Discard a card: This creature gets +1/+1 until end of turn.

Haste
This creature enters with a +1/+1 counter on it for each other spell cast this turn.

Create X tapped 2/1 white and black Inkling creature tokens with flying. If X is 6 or more, destroy all noncreature, nonland permanents.

Equipped creature gets +1/+1 for each land you control.
Equip legendary creature
Equip

If this creature would die, put it on the bottom of its owner's library instead.

Destroy target creature or planeswalker. Its controller investigates. (Create a Clue token. It's an artifact with ", Sacrifice this token: Draw a card.")

: Add one mana of any color in your commander's color identity.

Other Merfolk get +1/+1 and have islandwalk. (They can't be blocked as long as defending player controls an Island.)

This creature gets +1/+1 for each creature card in your graveyard.
, , Sacrifice another creature: Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle. Activate only as a sorcery.

Whenever this Vehicle attacks, you may sacrifice another artifact or creature. If you do, put a +1/+1 counter on this Vehicle and it gains menace until end of turn.
Crew 2 (Tap any number of creatures you control with total power 2 or more: This Vehicle becomes an artifact creature until end of turn.)

Return target artifact, enchantment, or land to its owner's hand.

Sacrifice X lands. For each land sacrificed this way, draw a card. You may play X additional lands this turn. Lands you control enter tapped this turn.

Whenever a creature or enchantment you control enters this turn, draw a card.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

First strike, vigilance
Akiri gets +1/+0 for each artifact you control.
Partner (You can have two commanders if both have partner.)

: Add .
: Add or . This artifact deals 1 damage to you.

Discard a card: This creature gets +2/-2 until end of turn.

When Eye of Vecna enters, you draw a card and you lose 2 life.
At the beginning of your upkeep, you may pay . If you do, you draw a card and you lose 2 life.

First strike
Noncreature spells cost more to cast.

Target opponent sacrifices a creature of their choice.

Destroy target nonartifact, nonblack creature. It can't be regenerated.

Kicker
When this creature enters, copy the next instant or sorcery spell with mana value 2 or less you cast this turn when you cast it. If this creature was kicked, copy that spell twice instead. You may choose new targets for the copies.

Whenever Emmara becomes tapped, create a 1/1 white Soldier creature token with lifelink.

: This turn, each creature you control enters with an additional +1/+1 counter on it.
, Remove a +1/+1 counter from a creature you control: Draw a card.

Destroy target artifact. Smash to Smithereens deals 3 damage to that artifact's controller.

: Creatures you control gain haste until end of turn.
: Create a 5/5 red Dragon Spirit creature token with flying. Activate only if you control an attacking modified creature. (Equipment, Auras you control, and counters are modifications.)

: Add .
: Add or . This artifact deals 1 damage to you.

When this creature enters, add .

Return target card from your graveyard to your hand.

Counter target spell. Choose 1, 2, or 3 at random. Its controller mills that many cards, then exiles cards from the top of their library until they exile a nonland card with a different name than that spell. They may cast that card without paying its mana cost. Then they put the exiled cards on the bottom of their library in a random order.

Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)
: This creature gets +1/+1 until end of turn.

Choose one —
• Search your library for up to X land cards, reveal them, put them into your hand, then shuffle.
• Nylea's Intervention deals twice X damage to each creature with flying.