Stardust Dragon

Synchro 8 (You may cast this spell without paying its mana cost by sacrificing two or more creatures under your control whose total mana cost equals its Synchro value.)

Flying, Haste

Sacrifice Stardust Dragon: Counter target spell or ability that would destroy one or more cards on the battlefield. Return Stardust Dragon to the battlefield at the beginning of the next end step.

One of the possessors of the Mark of the Dragon.