Rainbow Dragon

Flying
Sunburst
{w}{u}{b}{r}{g}: Remove Rainbow Dragon from the
game and summon it again. (This counts as casting
and may only be used once per turn.)
Prism— {x}, remove {x} +1/+1 counters from
Rainbow Dragon to add {x} mana to your mana
pool. This mana does not empty from your pool as
steps and phases end and may be spent as any color. You may only activate this ability once per turn.