Billy Idol

Whenever Billy Idol enters the battlefield or
deals damage to a player, create a Pop or a Rock
token.
Whenever Billy Idol attacks, you may pay {2}.
If you do, he gains +1/+1 until the end of turn.
If you paid {r} to activate this ability, you may
sacrifice a creature you control; Billy Idol deals
damage equal to the power of that creature to a
target opponent.