Glacial Agnaktor

Spend only mana produced by Snow sources
to cast this spell's colored mana cost. It's a
Snow creature

When Glacial Agnaktor enters or leaves the
battlefield, put a stun counter on target
permanent. Whenever a stun counter is put on
a creature, you may untap target land.

{s}: Glacial Agnaktor gets +0/+2 until the end
of the turn.