Flak Guns

Defender, Reach
When Flak Guns blocks a creature with flying, it
gets +3/+0 until end of turn.
"So why can't we just use these things at max power
and blast anything that comes at us to the ground?"
"Because that would be breaking the game, look at our
mana cost, it's only 4, and we're not even legendary.
I've asked for a promotion, but we always get turned
down."
"Oh yeah, I always forget about that."