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Quando questa creatura entra, se controlli tre o più creature, riprendi in mano una carta permanente bersaglio dal tuo cimitero.
If you don't control three or more creatures immediately after Dundoolin Weaver enters, its ability won't trigger. If you don't control three or more creatures as the ability tries to resolve, it won't resolve and none of its effects will happen. It doesn't matter if any of the creatures you control when the ability resolves are the same creatures as the ones you controlled when it triggered.