yugioh structure deck zombie horde Yu-Gi-Oh! - as long as you control a Level 5 or higher Zombie Yugioh! Zombie Horde Structure Deck

I urge you to do your own research, either through looking at your commanders page on EDHREC, or searching on Scryfall for the right cards for your deck

The description is split in: [Level of the Monster] , Effect that activates if it's Normal or Special Summoned / Level of the Dragon it can Swap with

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Legacy players pretty quickly realized that the card was super busted, but the only way to get the card was through Commander precons

Once you announce that you're casting a spell, players can't attempt to remove Shimmer Myr from the battlefield to make that casting illegal