Cosmic Flare (Common)

Target 1 "Stardust" Synchro Monster you control, this turn, if that Synchro Monster you control battles an opponent's monster, shuffle that opponent's monster into the Deck at the start of the Damage Step. If a "Stardust" Synchro Monster you control would Tribute itself to activate its effect, you can banish this card from your Graveyard instead.