Mocking bird is played with x=1 (totaling 2 mana) but only one mana is tapped and target creature (2 mana) can’t be copied
Platform iPad
1
vote
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Rezzahan#77802
commented
Momo made your Mockingbird cost one less mana. And since the effect looks at actual mana spent, and not mana value of the spell, one mana it is. So you can only copy a creature with mana value 1.