Change as many monsters on the field as possible to face-down Defense Position, then, if either player controls a face-up monster(s), they must send all face-up monsters they control to the GY.
Change as many monsters on the field as possible to face-down Defense Position, then, if either player controls a face-up monster(s), they must send all face-up monsters they control to the GY.
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Poseidra, the Storming Atlantean - SUDA-EN016 - Quarter Century Secret Rare - 1st Edition