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Ok Appa, Steadfast Guardian [Borderless] #316 (Magic Avatar: The Last Airbender) Details Full Price Guide: Appa, Steadfast Guardian [Borderless] #316 (Magic Avatar: The Last Airbender) All prices are the current market price

You can only use this effect of "Muddy Mudragon" once per turn

You don't choose a creature card when Scout's Warning resolves

SR Super Rare Lavalval Exlord X FIRE Level 8 [ WarriorSynchroEffect ] ATK 2900 DEF 200 1 Tuner + 1+ non-Tuner FIRE monsters When your opponent activates an effect of a monster on the field or in their hand (Quick Effect): You can destroy that monster, and if you do, inflict 1000 damage to your opponent

OK, that last part might need some clarification

This can have value in aggressive decks that have burn spell instants to back up the creatures