The Skullspore Nexus
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Nexus des spores crâniennes (The Skullspore Nexus) (fr)

Legendary Artifact (CMC 8)
This spell costs less to cast, where X is the greatest power among creatures you control.
Whenever one or more nontoken creatures you control die, create a green Fungus Dinosaur creature token with base power and toughness each equal to the total power of those creatures.
, : Double target creature's power until end of turn.