Iron and Silver

Flip a coin. If the coin lands on heads this spell
comes into play under your control. If the coin
lands on tails this spell comes under the control of target opponent.
Choose target player, creatures that player control
gain +2/+0 if they are blocking or become blocked
by humans, elves, or dwarfs.
Choose another target player, creatures that player controls gain +2/+0 if they are blocking or become blocked by creatures other than humans, elves or dwarfs.