Ally Duel

Enchant Target Creature. That creature
can only attack 1 creature for the rest of the
game, but gains +2/+2. Choose who it will
be attacking. Once enchanted creature or
the Creature they are attacking dies the enchantment is sent to your Graveyard,
and the Enchantment is no longer active.
To keep the 2/2 counter, pay {2} mana.