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Flying
Gadrak, the Crown-Scourge can't attack unless you control four or more artifacts.
At the beginning of your end step, create a Treasure token for each nontoken creature that died this turn. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")
Gadrak's last ability counts creatures that died during the entire turn, even ones that died before Gadrak entered the battlefield.
Once Gadrak has attacked, it will remain an attacking creature even if you no longer control four or more artifacts.
