Gary The DM

+1: summon trap! target creature gets exiled, another target creature takes 1d4 damage, and another target creature gets tapped. All your choice
-2: summon one 2/1 green ranger with reach, one 1/2 blue wizard with hexproof, one 3/2 red fighter, and one 2/1 black rogue with deathtouch
-12: roll a d20, if you roll a 19 or 20, you win the game, 8 to 18, destroy target permanent, 1 to 7, nothing happens