Radiant's Memorial

Whenever a creature enters the battlefield under your control, you may have Radiant's Memorial become a 3/3 white angel artifact creature with flying, vigilance and gets +1/+1 for each other creature with flying on the battlefield until end
of turn. Long as this artifact is a creature, other creatures you control get +1/+1 and have flying, vigilance.
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"Even in death some still believe Radiant the Archangel was the true leader of Serra's r