Frost Wraith

Snow-covered swampwalk

Frost Wraith's toughness is equal to the number of
snow-covered swamps you control. Its power is equal to the number of snow-covered lands in play with a frost token on them.

{t}: Put a frost token on target non-snow-covered basic land. While it has a frost token on it, it is a
snow-covered land of the same type.