Mizzix of the Izmagnus
Legendary Creature — Goblin Wizard
Rarity
Mythic
Mana Cost
Artist
Zoltan Boros
Power / Toughness
2 / 2
Oracle Text
Whenever you cast an instant or sorcery spell with mana value greater than the number of experience counters you have, you get an experience counter. Instant and sorcery spells you cast cost
less to cast for each experience counter you have.
Rulings (9)
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Wizards of the CoastIf there are additional costs to cast a spell, or if the cost to cast a spell is increased by an effect (such as the one created by Thalia, Guardian of Thraben's ability), apply those increases before applying cost reductions.
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Wizards of the CoastExperience counters are the second kind of counters a player can have, joining poison.
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Wizards of the CoastIf an instant or sorcery spell you cast has
in its mana cost, you choose the value of X before calculating the spell's total cost. For example, if that spell's mana cost is and you have one experience counter, you could choose 5 as the value of X and pay 
to cast the spell.
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Wizards of the CoastAll experience counters are identical, no matter how you got them. For example, the last ability will count experience counters that you got from the first ability, from another ability, from proliferating, and so on.
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Wizards of the CoastYou finish casting a spell, including paying its costs, before Mizzix's first ability triggers. The ability that gives you the experience counter will resolve before the spell that caused it to trigger.
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Wizards of the CoastMizzix's last ability doesn't change the mana cost or mana value of any spell. It changes only the total cost you pay.
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Wizards of the CoastEach game pack includes a card labeled "Experience" with the suggestion "Place your experience counters here." This card isn't required for play. It's simply a convenient spot to put your experience counters, which can be represented with dice, glass beads, or other small items.
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Wizards of the CoastMizzix's last ability can't reduce the amount of colored mana you pay for a spell. It reduces only the generic component of that cost.
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Wizards of the CoastThe cost reduction can apply to alternative costs such as flashback costs.