War Mage

Level 1: Whenever an opponent casts a spell on
your turn, deal 2 damage to its controller.
{2}{u/r} Level 2: When you cast a nonpermanent
spell, creatures you control gain +1/0 or 0/+1
until your next turn.(This can only trigger three
times per turn.)
{5}{u/r} Level 3: Whenever you attack with four or
more creatures, you may play an Instant or
Sorcery with mana value four or less from hand
without paying its cost.