Flying Men

Unsummon

Return target creature to its owner's hand.

Goblin Balloon Brigade

{R}: Goblin Balloon Brigade gains flying until end of turn.

Psychic Venom

Enchant land
Whenever enchanted land becomes tapped, Psychic Venom deals 2 damage to that land's controller.

Disintegrate

Disintegrate deals X damage to any target. If it's a creature, it can't be regenerated this turn, and if it would die this turn, exile it instead.

Mountain

Detonate

Destroy target artifact with mana value X. It can't be regenerated. Detonate deals X damage to that artifact's controller.

Brassclaw Orcs

Brassclaw Orcs can't block creatures with power 2 or greater.

Mind Bomb

Each player may discard up to three cards. Mind Bomb deals damage to each player equal to 3 minus the number of cards they discarded this way.

Island

Manabarbs

Whenever a player taps a land for mana, Manabarbs deals 1 damage to that player.

Unstable Mutation

Enchant creature
Enchanted creature gets +3/+3.
At the beginning of the upkeep of enchanted creature's controller, put a -1/-1 counter on that creature.