Storm Dragon

Flying
{x}{u/r}{r/g}: Discard a card, deal X damages to all
players. Also if {g} was used to pay for this ability
cost, deal X damages to all other creatures with
flying. If {r} was used to pay for this ability cost,
deal 3 damages to target creature. If {u} was used
to pay for this ability cost, tap X non-flying
creatures.