Ho-Oh, the Blazing Rainbow

Flying, haste.
At the beginning of each combat, you may pay {4}. If you do, add {w}{u}{b}{r}{g}.
{w}{u}{b}{r}{g}: Return target creature card from
your graveyard to the battlefield. Put a +1/+1
counter on it.
It soars high above Johto, cloaked in a rainbow glow.