$7.52
Combat Celebrant 
Creature — Human Warrior
Amonkhet Mythic
If Combat Celebrant hasn't been exerted this turn, you may exert it as it attacks. When you do, untap all other creatures you control and after this phase, there is an additional combat phase. (An exerted creature won't untap during your next untap step.)
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#125 — Illus. Chris Rallis