Cold Front

Cold Front enters tapped with a stun counter
on it. (If a permanent with a stun counter on it would be untapped, instead remove a stun counter from it.)

{t}: Add {w} or {u}

Forecast — {w}{w}{u}{u}, Reveal Cold Front from your hand: Put a stun counter on target permanent. (Activate this ability only during your upkeep and only once each turn.)