Yellow Diamond, Decider

Protection from red and green.
Defender, Haste, Vigilance, Reach, Ward {4}.
During your upkeep put a +1/+0 counter on
Yellow Diamond. When it has 7 power or more,
it loses Defender and gains Trample.
{x},{t}: Add X plus 1 {r} or {g} in any combination.
{x}{r},{t}: Yellow Diamond deals damage equal to
its power minus 1 to X targets.