Players can't untap more than one creature during their untap steps.

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

Each player chooses a number of lands they control equal to the number of lands controlled by the player who controls the fewest, then sacrifices the rest. Players discard cards and sacrifice creatures the same way.

Target player activates a mana ability of each land they control. Then that player loses all unspent mana and you add the mana lost this way.

Enchant artifact
At the beginning of the upkeep of enchanted artifact's controller, this Aura deals 1 damage to that player.

Enchant creature
: Enchanted creature gets +1/+1 until end of turn.

First strike

, : Target player mills two cards.

Players skip their untap steps.
At the beginning of your upkeep, sacrifice this enchantment unless you pay .

White creatures get +1/+1.

As long as this artifact is untapped, players can't untap more than one land during their untap steps.

Destroy X target Mountains. Volcanic Eruption deals damage to each creature and each player equal to the number of Mountains put into a graveyard this way.

, Discard a card at random: Target creature gets +2/+2 until end of turn.

Enchant artifact an opponent controls
Whenever enchanted artifact becomes tapped, choose one —
• This Aura deals 1 damage to target player or planeswalker.
• Target player gains 1 life.

Blue creatures don't untap during their controllers' untap steps.
At the beginning of each player's upkeep, that player may choose any number of tapped blue creatures they control and pay for each creature chosen this way. If the player does, untap those creatures.

: Until your next upkeep, target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value.

: Destroy target tapped creature.

, : Untap target attacking creature you control. Prevent all combat damage that would be dealt to and dealt by that creature this turn.

When this creature dies, you gain 2 life.

The next time a source of your choice would deal damage to you this turn, prevent that damage. You gain life equal to the damage prevented this way.

Whenever this creature deals damage, you gain that much life.

You may spend white mana as though it were red mana.

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
Haste (This creature can attack and as soon as it comes under your control.)
At the beginning of the end step, sacrifice this creature.

: This creature gets +1/+0 until end of turn.

Other Goblins get +1/+1 and have mountainwalk.

When this creature attacks or blocks, at end of combat, sacrifice it and it deals 5 damage to you.
, : Return target permanent that isn't enchanted to its owner's hand.

Whenever you cast an enchantment spell, you may draw a card.

Other Zombie creatures have swampwalk. (They can't be blocked as long as defending player controls a Swamp.)
Other Zombies have ": Regenerate this permanent."

Tap all lands target player controls and that player loses all unspent mana.

: Target creature other than this creature has base power and toughness 0/2 until end of turn.

Whenever a player taps a land for mana, that player adds one mana of any type that land produced.

, : Target player discards a card. Activate only during your turn.

All Forests are 1/1 creatures that are still lands.

All Swamps are 1/1 black creatures that are still lands.

, : Draw a card.

Destroy all creatures. They can't be regenerated.