You may return two Islands you control to their owner's hand rather than pay this spell's mana cost.
Draw two cards.

Target player reveals their hand. You choose a nonland card from it. That player discards that card. You lose 2 life.

Target player discards X cards at random.

Sneak (You may cast this spell for if you also return an unblocked attacker you control to hand during the declare blockers step. He enters tapped and attacking.)
Whenever Donatello deals combat damage to a player, create a token that's a copy of target artifact you control.

When Dogmeat enters, mill five cards, then return an Aura or Equipment card from your graveyard to your hand.
Whenever a creature you control that's enchanted or equipped attacks, create a Junk token. (It's an artifact with ", Sacrifice this token: Exile the top card of your library. You may play that card this turn. Activate only as a sorcery.")

Magical Tinkering — , , Sacrifice an artifact: Search your library for an artifact card with mana value equal to 1 plus the sacrificed artifact's mana value, put it onto the battlefield, then shuffle. Activate only as a sorcery.

Counter target spell unless its controller pays .

Each opponent who controls more creatures than you can't cast creature spells. The same is true for artifacts and enchantments.
Each opponent who controls more lands than you can't play lands.

, : Reveal cards from the top of your library until you reveal a basic land card. Put that card into your hand and all other cards revealed this way into your graveyard.

Each player may search their library for up to X basic land cards and put them onto the battlefield tapped. Then each player who searched their library this way shuffles.

This creature gets +1/+1 for each other creature on the battlefield named Relentless Rats.
A deck can have any number of cards named Relentless Rats.

: Add .
, Sacrifice this land: Destroy target land.

Domain — Creatures can't attack you unless their controller pays for each creature they control that's attacking you, where X is the number of basic land types among lands you control.

As an additional cost to cast this spell, sacrifice a creature.
Search your library for a card, put that card into your hand, then shuffle.

Whenever an opponent draws their second card each turn, you create a Treasure token.
: Two target players each draw a card.

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

Flying, trample

You may play lands from your graveyard.

Whenever this creature is dealt damage, it deals that much damage to you.

: Add .
Sacrifice this artifact: Add .