The Mirari Conjecture
Dominaria — Rare
Enchantment — Saga
Sets The Mirari Conjecture has been printed in:

Dominaria — Rare
Enchantment — Saga
Sets The Mirari Conjecture has been printed in:

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Battle — Siege // Enchantment
(As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.)
When Invasion of Arcavios enters, search your library, graveyard, and/or outside the game for an instant or sorcery card you own, reveal it, and put it into your hand. If you search your library this way, shuffle.
Invocation of the Founders
Whenever you cast an instant or sorcery spell from your hand, you may copy that spell. You may choose new targets for the copy.
Legendary Planeswalker — Chandra
Whenever you cast an instant or sorcery spell, copy it. You may choose new targets for the copy. This ability triggers only once each turn.
+2: Add two mana in any combination of colors.
+1: Exile the top five cards of your library. Until the end of your next turn, you may cast an instant or sorcery spell from among those exiled cards.
-X: Chandra, Hope's Beacon deals X damage to each of up to two targets.
Creature — Spirit (5/5)
Flying
When Geist of Regret enters the battlefield, put a random instant card from your library into your graveyard. Then put a random sorcery card from your library into your graveyard.
Whenever you cast an instant or sorcery spell from your graveyard, copy that spell. You may choose new targets for the copy.
Legendary Planeswalker — Will
+2: Until your next turn, up to two target creatures each have base power and toughness 0/3 and lose all abilities.
-2: Target player draws two cards. Until your next turn, instant, sorcery, and planeswalker spells that player casts cost less to cast.
-8: Target player gets an emblem with "Whenever you cast an instant or sorcery spell, copy it. You may choose new targets for the copy."
Partner with Rowan Kenrith
Will Kenrith can be your commander.
Conspiracy
Hidden agenda (Start the game with this conspiracy face down in the command zone and secretly choose a card name. You may turn this conspiracy face up any time and reveal that name.)
Whenever you cast an instant or sorcery spell with the chosen name, you may copy it. You may choose new targets for the copy.
Legendary Planeswalker — Jace
You can't cast Jace Reawakened during your first, second, or third turns of the game.
+1: Draw a card, then discard a card.
+1: You may exile a nonland card with mana value 3 or less from your hand. If you do, it becomes plotted.
-6: Until end of turn, whenever you cast a spell, copy it. You may choose new targets for the copy.
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