Combat Celebrant

Bracket

• B1 Exhibition — Not in the same deck as its two-card combo partners: Helm of the Host, Kiki-Jiki, Mirror Breaker, Rionya, Fire Dancer, Splinter Twin, Mirage Phalanx, Saheeli, the Sun's Brilliance, Sandstorm Crasher
• B2 Core — Not in the same deck as its two-card combo partners: Helm of the Host, Kiki-Jiki, Mirror Breaker, Rionya, Fire Dancer, Splinter Twin, Mirage Phalanx, Saheeli, the Sun's Brilliance, Sandstorm Crasher
• B3 Upgraded — Not in the same deck as its early two-card combo partners: Helm of the Host, Kiki-Jiki, Mirror Breaker, Rionya, Fire Dancer, Splinter Twin, Mirage Phalanx, Saheeli, the Sun's Brilliance, Sandstorm Crasher
• B4 Optimized — allowed: No restriction beyond the banned list
• B5 cEDH — allowed: No restriction beyond the banned list

Why

• Two-card combo with Helm of the Host, Kiki-Jiki, Mirror Breaker, Rionya, Fire Dancer, Splinter Twin, Mirage Phalanx, Saheeli, the Sun's Brilliance, Sandstorm Crasher (early with Helm of the Host, Kiki-Jiki, Mirror Breaker, Rionya, Fire Dancer, Splinter Twin, Mirage Phalanx, Saheeli, the Sun's Brilliance, Sandstorm Crasher)

How Lotus Vault estimates a bracket

Bracket: Lotus Vault analysis, with Commander Spellbook flags

Combos

320 known combos, 7 of them two-card.

• Combat Celebrant + Helm of the Host
  Produces: Infinite combat phases, Infinite creature ETB, Infinite mana creatures you control can produce
  View on Commander Spellbook
• Combat Celebrant + Kiki-Jiki, Mirror Breaker
  Produces: Infinite combat phases, Infinite creature tokens with haste, Infinite creature ETB
  View on Commander Spellbook
• Rionya, Fire Dancer + Combat Celebrant
  Produces: Infinite combat phases, Infinite creature tokens with haste, Infinite creature ETB
  View on Commander Spellbook

Combos: Commander Spellbook

Rulings

• 2017-04-18 · Wizards of the Coast
  If you exert Combat Celebrant, you get an additional combat phase even if Combat Celebrant doesn't survive the first combat phase.
• 2017-04-18 · Wizards of the Coast
  You can't exert a creature unless an effect allows you to do so. Similar effects that "tap and freeze" a creature (such as that of Decision Paralysis) don't exert that creature.
• 2017-04-18 · Wizards of the Coast
  If an exerted creature is already untapped during your next untap step (most likely because it had vigilance or an effect untapped it), exert's effect preventing it from untapping expires without having done anything.
• 2017-04-18 · Wizards of the Coast
  All cards in the Amonkhet set that let you exert a creature let you do so as you declare it as an attacking creature, as do some of the cards in the Hour of Devastation set. You can't do so later in combat, and creatures put onto the battlefield attacking can't be exerted. Any abilities that trigger on exerting an attacking creature will resolve before blockers are declared.
• 2017-04-18 · Wizards of the Coast
  Combat Celebrant's ability untaps all of your creatures, not just the ones that are attacking.
• 2017-04-18 · Wizards of the Coast
  If you exert multiple Combat Celebrants in one combat phase, you'll have that many additional combat phases, but all of your creatures are untapped only during the current combat phase. You'll need to exert the Combat Celebrants one at a time, in multiple combat phases, to untap your attacking creatures and attack with them in each combat step.
• 2017-04-18 · Wizards of the Coast
  Untapping an attacking creature doesn't remove it from combat.
• 2017-04-18 · Wizards of the Coast
  If you gain control of another player's creature until end of turn and exert it, it will untap during that player's untap step.
• 2017-04-18 · Wizards of the Coast
  There's no main phase between your combat phases, so you'll have no opportunity to cast spells or activate abilities that could only be cast any time you could cast a sorcery. For example, you won't be able to cast another creature or equip Equipment between combats.

Rulings: Scryfall · Wizards of the Coast