Whenever this land becomes tapped, it deals 1 damage to you.
: Add one mana of any color.

: 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.)

You may have Sakashima the Impostor enter as a copy of any creature on the battlefield, except its name is Sakashima the Impostor, it's legendary in addition to its other types, and it has ": Return Sakashima the Impostor to its owner's hand at the beginning of the next end step."

(: Add or .)
As this land enters, you may pay 2 life. If you don't, it enters tapped.

Equipped creature gets +1/+1 and has trample and lifelink.
: Permanents your opponents control lose hexproof and indestructible until end of turn.
Equip

Whenever a player casts a red spell, you may pay . If you do, you gain 1 life.

Lifelink
If a nontoken creature an opponent controls would die, instead exile that card and create a 2/2 black Zombie creature token.
, Sacrifice another Vampire or Zombie: Put two +1/+1 counters on Kalitas.

, : Create a Food token. (It's an artifact with ", , Sacrifice this token: You gain 3 life.")
Whenever you sacrifice a Food, create a tapped Treasure token. (It's an artifact with ", Sacrifice this token: Add one mana of any color.")

As this land enters, choose a creature type.
: Add .
: Add one mana of any color. Spend this mana only to cast a creature spell of the chosen type, and that spell can't be countered.

Zhou Yu can't attack unless defending player controls an Island.

Until your next turn, your life total can't change and you gain protection from everything. All permanents you control phase out. (While they're phased out, they're treated as though they don't exist. They phase in before you untap during your untap step.)
Exile Teferi's Protection.

At the beginning of your upkeep, you lose 1 life and create a 1/1 black Faerie Rogue creature token with flying.

Whenever you cast a creature spell, put X +1/+1 counters on target creature you control, where X is that spell's mana value.
Landfall — Whenever a land you control enters, create a 2/2 green Bear creature token.

Defender (This creature can't attack.)
: This creature gets +1/+0 until end of turn.

First strike, reach
Whenever Lara Croft attacks, exile up to one target legendary artifact card or legendary land card from a graveyard and put a discovery counter on it. You may play a card from exile with a discovery counter on it this turn.
Raid — At end of combat on your turn, if you attacked this turn, create a Treasure token.

Skip your draw step.
Whenever you discard a card, exile that card from your graveyard.
Pay 1 life: Exile the top card of your library face down. Put that card into your hand at the beginning of your next end step.

When Urza enters, create a 0/0 colorless Construct artifact creature token with "This token gets +1/+1 for each artifact you control."
Tap an untapped artifact you control: Add .
: Shuffle your library, then exile the top card. Until end of turn, you may play that card without paying its mana cost.

Karn's power and toughness are each equal to the greatest mana value among artifacts you control.
At the beginning of your upkeep, add for each artifact you control. This mana can't be spent to cast nonartifact spells. Until end of turn, you don't lose this mana as steps and phases end.

Return target creature to its owner's hand.