If you control two or more other lands, this land enters tapped. {T}: Add {G}. {X}{G}: Until end of turn, this land becomes an X/X green Hydra creature. It's still a land. X can't be 0.
Whenever a land you control enters from anywhere other than your hand or you cast a spell from anywhere other than your hand, create a 3/3 red Spawn creature token.
The gods of Chaos bestow gifts of mutations upon their champions. Too many of these gifts transform their bearer into mindless, writhing chaos spawn.
[+1]: Untap target Mountain. It becomes a 4/4 red Elemental creature until end of turn. It's still a land. [–2]: Add {R} for each Mountain you control. [–5]: You get an emblem with "Mountains you control have '{T}: This land deals 1 damage to any target.'"
Sacrifice X Zombies, then reveal cards from the top of your library until you reveal a number of Zombie creature cards equal to the number of Zombies sacrificed this way. Put those cards onto the battlefield and the rest on the bottom of your library in a random order.
Blue, black, and/or red creature cards in your graveyard have unearth. The unearth cost is equal to the card's mana cost. Whenever chaos ensues, put target creature card from a graveyard onto the battlefield under your control.
Whenever you attack, up to one target attacking creature can't be blocked this turn. At the beginning of the next end step, return that creature to its owner's hand. If you do, it perpetually gets +1/+1.
Double strike Specialize {1} When you cast this spell, it gains "When this creature becomes the target of a spell or ability an opponent controls, you may exile this creature, then return it to the battlefield under its owner's control."
Creatures you control get +1/+0 and have haste. At the beginning of your end step, exile any number of nontoken artifacts and/or creatures you control. Return those cards to the battlefield under their owner's control at the beginning of your next upkeep.
When this creature enters, starting with you, each player chooses up to five permanents they control. All permanents other than this creature that weren't chosen this way phase out. Permanents can't phase in.
When this creature enters, scry 2. {T}: Create X 1/1 colorless Pilot creature tokens, where X is the number of Mounts and/or Vehicles that entered the battlefield under your control this turn. The tokens have "This token saddles Mounts and crews Vehicles as though its power were 2 greater."