Once per turn, when you activate an Artmage monsters effect, you can quickly change that activated effect to the following: Destroy all cards your opponent controls. Seeing play in the Power Patron Artmage strategy and even mass play in Clown Crew , this is the perfect monster for the Decks to trigger any effect that needs a Tribute for Summons or for activating their effect
Negate any card effect that would move a card in the GY to a different place
Magical Mallet lets you send any number of cards from your hand back into your deck, shuffling your deck and drawing the same number of cards back
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Just looking at the effect, it's pretty good
Once per turn: You can return as many of your opponent's banished cards as possible to their GY, and if you do, the first battle or effect damage your opponent takes this turn becomes doubled