Poké-BODY ⇢ Icy Aura
As long as Mamoswine GL is your Active Pokémon, put 1 damage counter on each Active Pokémon (excluding {W} Pokémon) (both yours and your opponent’s) between turns.

{W}{W}{C}{C} → Avalanche : 60
Flip a coin. If heads, this attack does 10 damage to each of your opponent’s Benched Pokémon. (Don’t apply Weakness and Resistance for Benched Pokémon.)