Gatecrash

Defender Evolve (Whenever a creature enters the battlefield under your control, if that creature has greater power or toughness than this creature,...

Keymaster Rogue can't be blocked. When Keymaster Rogue enters the battlefield, return a creature you control to its owner's hand.

Target blocking creature gets +3/+0 and gains first strike until end of turn.

Target opponent loses 3 life. Cipher (Then you may exile this spell card encoded on a creature you control. Whenever that creature deals combat dam...

Enchant creature Enchanted creature gets -X/-X, where X is the number of creature cards in its controller's graveyard.

Enchant land Enchanted land has "{T}: Target creature gains flying until end of turn. Activate only as a sorcery."

Flying {U}: Metropolis Sprite gets +1/-1 until end of turn.

When Leyline Phantom deals combat damage, return it to its owner's hand. (Return it only if it survived combat.)

Destroy target blocked creature.

Prevent all combat damage that would be dealt to Armored Transport by creatures blocking it.

Exile target creature or enchantment.

Target opponent discards two cards and you gain 2 life.

Create two 2/2 white Knight creature tokens with vigilance.

Flying, trample

Battalion — Whenever Warmind Infantry and at least two other creatures attack, Warmind Infantry gets +2/+0 until end of turn.

Target player sacrifices an artifact and a land. Structural Collapse deals 2 damage to that player.

Mugging deals 2 damage to target creature. That creature can't block this turn.

Flying