Regice

Elementals you control get +0/+3 and can block
any number of creatures each combat.
Whenever Regice blocks a creature, you and that creature's controller each untap a number of nonattacking creatures they control equal to the
amount of combat damage done to Regice. For
each creature that they can't untap, that player
mills cards and you draw cards equal to Regice's toughness.