The Wall of Frozen Winds

{t}: Add {u}{w} to the activating player's mana pool.
Only opponents may activate this ability.
When tapped, each player who did not tap it
creates a 0/5 Legendary Ice Golem creature token
named Karik, Eternal Bellower.
At the beginning of your first main phase, if there
are no creatures named Karik, Eternal Bellower,
your creature spells gain explore this turn.