All Out War

Indestructible.
All out war may only be cast and pay it's
effects with {r}, {b} &/or {w} mana.
{2}: All attacking creatures you control gain
+1/+1 and trample until end of turn. This
effect may only be used if you attacked with
at least 2 creatures this turn, plus it may be
used once per turn.
"There will be no peace until one of our armies lies destroyed."