Controlled Instincts

Oracle Text

Enchant red or green creature

Enchanted creature doesn't untap during its controller's untap step.

Card Rulings

2/1/2009 Controlled Instincts may target and may enchant an untapped creature.
2/1/2009 Controlled Instincts can enchant only a creature that’s red or green. If at any time the enchanted creature is neither red nor green, Controlled Instincts is put into its owner’s graveyard as a state-based action.