Icefire Wight

Icefire Wight gets +1/+1 as long as you
control a Swamp or Sno-Covered Island..
At end of combat, each creature blocking or
blocked by Icefire Wight and tap those
creatures.
If Icefire Wight is in play, those creatures only
untap if their controllers pay 4 or {r}{r} during
their upkeep phase.
"A huge cold bonfire, that chases you."