Winter Whale

Whenever Winter Whale enters play, you may
exile target creature defending player controls
until Winter Whale leaves the battlefield. (That
creature returns under its owner's control.)
When you play a snow permanent, draw a card.
Cumulative Upkeep {s} (At the beginning of your
upkeep, put an age counter on this permanent, then
sacrifice it unless you pay its upkeep cost for each
age counter on it.)