Gathunth, The Rainbow Maker

Rainbow (Spend only colored mana to cast this.
No more than one mana of each color may be spent)
Kicker {w} gains Double strike.
Kicker {u} gains At the beginning of your
upkeep scry 1.
Kicker {b} gains Whenever Gathunth deals com-
bat damage to a player, that player discards a card.
Kicker {r} gains At the beginning of your
upkeep you may goad target creature.
Kicker {g} gains Whenever you cast a creature
spell, draw a card