Icefall

Flying 1S: Snow creatures you control get +1/+1 until end of turn. (S can be paid with one mana from a snow source.)

(T: Add R.)

Reach (This creature can block creatures with flying.) Whenever this creature blocks a creature with flying, put a +1/+1 counter on this creature at end of combat.

Destroy target Plains or Island. Cryoclasm deals 3 damage to that land's controller.

Snow landwalk (This creature can't be blocked as long as defending player controls a snow land.) S: Regenerate this creature. (S can be paid with one mana from a snow source.)

Skred deals damage to target creature equal to the number of snow permanents you control.

Flying Prevent all damage that would be dealt to this creature by creatures with first strike.

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.