Possibility Storm

Bracket

• B1 Exhibition — Not in the same deck as its two-card combo partners: Vexing Bauble, Drannith Magistrate, Void Mirror, Rule of Law, Archon of Emeria, Deafening Silence, Boromir, Warden of the Tower, Eidolon of Rhetoric, Soulless Jailer, Lavinia, Azorius Renegade, Teferi, Time Raveler, Teferi, Mage of Zhalfir, Arcane Laboratory
• B2 Core — Not in the same deck as its two-card combo partners: Vexing Bauble, Drannith Magistrate, Void Mirror, Rule of Law, Archon of Emeria, Deafening Silence, Boromir, Warden of the Tower, Eidolon of Rhetoric, Soulless Jailer, Lavinia, Azorius Renegade, Teferi, Time Raveler, Teferi, Mage of Zhalfir, Arcane Laboratory
• B3 Upgraded — Not in the same deck as its early two-card combo partners: Vexing Bauble, Drannith Magistrate, Void Mirror, Rule of Law, Archon of Emeria, Deafening Silence, Boromir, Warden of the Tower, Eidolon of Rhetoric, Soulless Jailer, Lavinia, Azorius Renegade, Teferi, Time Raveler, Teferi, Mage of Zhalfir, Arcane Laboratory
• B4 Optimized — allowed: No restriction beyond the banned list
• B5 cEDH — allowed: No restriction beyond the banned list

Why

• Two-card combo with Vexing Bauble, Drannith Magistrate, Void Mirror, Rule of Law, Archon of Emeria, Deafening Silence, Boromir, Warden of the Tower, Eidolon of Rhetoric, Soulless Jailer, Lavinia, Azorius Renegade, Teferi, Time Raveler, Teferi, Mage of Zhalfir, Arcane Laboratory (early with Vexing Bauble, Drannith Magistrate, Void Mirror, Rule of Law, Archon of Emeria, Deafening Silence, Boromir, Warden of the Tower, Eidolon of Rhetoric, Soulless Jailer, Lavinia, Azorius Renegade, Teferi, Time Raveler, Teferi, Mage of Zhalfir, Arcane Laboratory)

How Lotus Vault estimates a bracket

Bracket: Lotus Vault analysis, with Commander Spellbook flags

Combos

15 known combos, 13 of them two-card.

• Vexing Bauble + Possibility Storm
  Produces: Counter all spells players cast from their hands, Lock
  View on Commander Spellbook
• Possibility Storm + Drannith Magistrate
  Produces: Opponents can't cast spells, Lock
  View on Commander Spellbook
• Void Mirror + Possibility Storm
  Produces: Counter all spells players cast from their hands, Lock
  View on Commander Spellbook

Combos: Commander Spellbook

Rulings

• 2013-04-15 · Wizards of the Coast
  The original spell is part of the group of exiled cards put on the bottom of the library in a random order. If the exiled card that shared a card type with that card wasn't cast, it's also part of this group.
• 2013-04-15 · Wizards of the Coast
  Artifact, battle, creature, enchantment, instant, kindred, land, planeswalker, and sorcery are card types. Two cards share a card type if they have at least one card type in common.
• 2013-04-15 · Wizards of the Coast
  Instant and sorcery cards with miracle allow a player to cast a card immediately upon drawing it. If a player casts a spell this way, the spell is cast from that player's hand. Possibility Storm will trigger.
• 2013-04-15 · Wizards of the Coast
  If the spell you cast from exile has X in its mana cost, you must choose 0 as its value.
• 2013-04-15 · Wizards of the Coast
  If Possibility Storm's ability doesn't exile the original spell (perhaps because another Possibility Storm already exiled it), you'll still exile cards from the top of your library until you exile a card that shares a card type with it and have the opportunity to cast that spell.
• 2013-04-15 · Wizards of the Coast
  If you cast a spell without paying its mana cost, you can't choose to cast it for any alternative costs, such as overload costs. You can pay additional costs, such as kicker costs. If the spell has any mandatory additional costs, you must pay those.

Rulings: Scryfall · Wizards of the Coast