Masters Edition II

Snow Fortress

Defender
{1}: Snow Fortress gets +1/+0 until end of turn.
{1}: Snow Fortress gets +0/+1 until end of turn.
{3}: Snow Fortress deals 1 damage to target creature without flying that's attacking you.

Defender (This creature can't attack.)
{1}: Snow Fortress gets +1/+0 until end of turn.
{1}: Snow Fortress gets +0/+1 until end of turn.
{3}: Snow Fortress deals 1 damage to target creature without flying that's attacking you.

Ice Age

Counts as a wall
o1: +1/+0 until end of turn
o1: +0/+1 until end of turn
o3: Snow Fortress deals 1 damage to target creature without flying that is attacking you.