Ivy, Gleeful Spellthief

Bracket

• B1 Exhibition — allowed: No restriction at this bracket
• B2 Core — allowed: No restriction at this bracket
• B3 Upgraded — allowed: No restriction at this bracket
• B4 Optimized — allowed: No restriction beyond the banned list
• B5 cEDH — allowed: No restriction beyond the banned list

Why

• No Game Changer, mass land denial, extra turn, tutor or two-card combo

How Lotus Vault estimates a bracket

Bracket: Lotus Vault analysis, with Commander Spellbook flags

Combos

20 known combos.

• Ivy, Gleeful Spellthief + Jaheira, Friend of the Forest + Triton Cavalry
  Produces: Infinite storm count
  View on Commander Spellbook
• Ivy, Gleeful Spellthief + Cloudstone Curio + Jaheira, Friend of the Forest
  Produces: Infinite copies of a specific enchantment, Infinite storm count
  View on Commander Spellbook
• Ivy, Gleeful Spellthief + Cloudstone Curio + Treachery
  Produces: Gain control of all creatures, Infinite copies of a specific enchantment, Infinite mana lands you control can produce
  View on Commander Spellbook

Combos: Commander Spellbook

Rulings

• 2022-09-09 · Wizards of the Coast
  If the spell that's copied is modal (that is, it says "Choose one —" or the like), the copy will have the same mode. You can't choose a different one.
• 2022-09-09 · Wizards of the Coast
  The second ability triggers whenever a player casts a spell that targets only one creature and no other object or player. It doesn't matter who controls the creature.
• 2022-09-09 · Wizards of the Coast
  The copy is created even if the spell that caused the ability to trigger has been countered by the time the ability resolves. The copy resolves before the original spell.
• 2022-09-09 · Wizards of the Coast
  The controller of a copy can't choose to pay any additional costs for the copy. However, effects based on any additional costs that were paid for the original spell are copied as though those same costs were paid for the copy too. Notably, if the spell you copy was kicked, the copies will also be kicked.
• 2022-09-09 · Wizards of the Coast
  The copy that Ivy, Gleeful Spellthief's second ability creates is created on the stack, so it's not "cast." Other abilities that trigger when a player casts a spell won't trigger.
• 2022-09-09 · Wizards of the Coast
  If the spell that's copied has an X whose value was determined as it was cast, the copy has the same value of X.
• 2022-09-09 · Wizards of the Coast
  If a spell has multiple targets but all of them are the same creature, Ivy, Gleeful Spellthief's second ability will trigger.
• 2022-09-09 · Wizards of the Coast
  If Ivy, Gleeful Spellthief isn't a legal target for the spell, no copy can be created.

Rulings: Scryfall · Wizards of the Coast