Rimefeather Owl

Flying Cumulative upkeep—Gain control of a land you don't control. (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.) This creature gets +1/+1 for each land you control but don't own. When this creature leaves the battlefield, each player gains control of each land they own that you control.

2, T: Return target permanent to its owner's hand. Activate only if you control four or more snow permanents.

T: Add C. 1S, T: Look at the top card of your library. If that card is snow, you may reveal it and put it into your hand. (S can be paid with one mana from a snow source.)