Bitter Snows Wolf Pack

Exile a creature card from your graveyard:
Bitter Snows Wolf Pack gets +1/-1 or -1/+1
until end of turn.
Pack tactics (You may cast this spell as though
it had flash if you spend at least one mana produced by a creature to cast it.)
Predatory (Whenever this creature attacks,
target creature must block it this turn, if able.)