Against The Odds

Strive - Against The Odds costs {1}{w}
more to cast for each target beyond the first.
Any number of target creatures you control gain
+2/+2 until end of turn. Creatures your
opponents control get -1/-1 until end of turn.
You may cast this spell only if you control fewer
creatures than each opponent.
"Though we are overwhelmed in numbers, they can
never overwhelm our spirits."