Target creature's owner puts it on their choice of the top or bottom of their library. You create a Mutagen token. (It's an artifact with "{1}, {T}, Sacrifice this token: Put a +1/+1 counter on target creature. Activate only as a sorcery.")
"We strike hard and fade away into the night." —Leonardo
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$0.09 – $0.16
Nonfoil $0.09 Foil $0.16 Cardmarket €0.13
TCGplayer & Cardmarket market price
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