Combat Celebrant [Amonkhet Prerelease Promos] Zombie Elf Shaman if another creature is on

if another creature is on the battlefield

Set: Kaladesh Inventions Type: Artifact Rarity: Mythic Cost: {1} Mana Vault doesn't untap during your untap step

"The secret to invention is to see something in your mind

Set: Alpha Edition Type: Instant Rarity: Uncommon Cost: {W} Exile target creature

It has the strength of seven men

Combat Celebrant [Amonkhet Prerelease Promos] Zombie Elf Shaman if another creature is onSet: Amonkhet Prerelease Promos Type: Creature Human Warrior Rarity: Mythic Cost: {2}{R} 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.)