Bridgid, The Littlest Yeti

At the beginning of your end step, Bridgid explores.
Once during each of your turns, you may cast a snow spell from your graveyard. If a spell cast this way would be put into your graveyard, exile it instead.
At the beginning of combat on your turn, untap up to X target snow lands you control, where X is Bridgid's power. Until end of turn, they become 4/4 Yeti creatures with trample. They are still lands.