Ride of the Rohirim

Creatures you control gain first strike until end
of turn (creatures with first stike deal combat
damage before creatures without first strike.)
If {w} was spent to cast this spell, creatures you
control gain flanking until end of turn (whenever
a creature without flanking blocks a creature with flanking, the blocking creature gets -1/-1 until end of
turn.)
If {g} was spent to cast this spell, creatures you
control get +1/+1 until end of turn.