Woolly Mammoths

This creature has trample as long as you control a snow land.

Boreal Druid

Awesome Presence

Enchant creature
Enchanted creature can't be blocked unless defending player pays {3} for each creature they control that's blocking it.

Into the North

Search your library for a snow land card, put it onto the battlefield tapped, then shuffle.

Deadly Insect

Shroud (This creature can't be the target of spells or abilities.)

Giant Growth

Target creature gets +3/+3 until end of turn.

Boreal Centaur

{S}: This creature gets +1/+1 until end of turn. Activate only once each turn. ({S} can be paid with one mana from a snow source.)

Lat-Nam's Legacy

Shuffle a card from your hand into your library. If you do, draw two cards at the beginning of the next turn's upkeep.

Snow-Covered Island

Amrou Kithkin

This creature can't be blocked by creatures with power 3 or greater.

Unstable Mutation

Enchant creature
Enchanted creature gets +3/+3.
At the beginning of the upkeep of enchanted creature's controller, put a -1/-1 counter on that creature.

Llanowar Elves

Snow-Covered Plains

Reinforcements

Put up to three target creature cards from your graveyard on top of your library.