Void Mirror
Artifact (CMC 2)
Whenever a player casts a spell, if no colored mana was spent to cast it, counter that spell.
Decks with Void Mirror
[MH2] Modern Horizons 2 #242 (R)
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[MH2] Modern Horizons 2 #435 (R)
[MH2] Modern Horizons 2 #473 (R)
[PMH2] Modern Horizons 2 Promos #242s (R)
[PRM] Magic Online Promos #91377 (R)