Groke, Frozen Heart

Trample, protection from non-snow spells
Whenever Groke, Frozen Heart deals combat
damage to a player, that player taps and exerts
that many untapped nonland permanents they
control. Then, that player sacrifices an exerted
permanent they control.
He wanted to go away from the coldness and
motionlessness of her, far away from the terrifying
loneliness of her. But he couldn't move.