It is possible to cast Myr Superion only if all mana spent to cast it came from creatures. One of the ways that condition might be true is if NO mana is spent at all to cast Myr Superion. So if indeed the convoke can reduce the cost to free, then Superion can be cast.
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in the Chief Engineer thread someone created a deck to cast Myr Superion for free off Convoke.
Chief Engineer 1U
Creature - Vedalken Artificer
Artifact spells you cast have convoke.
1/3
Is this possible with the current Convoke rules?
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