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In theory

Enchantment - Aura Color tag templates(None) Realmbreaker's Grasp Enchant artifact or creature Enchanted permanent can't attack or block, and its activated abilities can't be activated unless they're mana abilities

Whats particularly fun about Backgrounds with Tahngarth is that they apply to all commanders you own, meaning they will continue to apply their effects to Tahngarth even while your opponents control him

You can also get more information about the legality of a specific card when looking it up in Gatherer

Its so full of value that the built-in protection from their ward ability feels like an afterthought