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Here's a fun deck that revolves around Guardian Beasts. Make the Guardian Beast indestructible to use the Nevinyrral's Disk over and over, and use the Urza's Armors and Thunderstaffs with Forcefield to prevent all combat damage to you. Pestilence with Urza's Armor will kill your opponents while you take no damage and indestructible Guardian Beast keeps Pestilence in play. As well as all your artifact.
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