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So, what happens here is that Slaking can be an excellent attacker by combining with Arceus VSTAR and Path to the Peak because, suddenly, you are forcing your opponent to draw a counter stadium or, otherwise, all their VSTAR Pokmon are going to go to the discard pile

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When you cast your next creature spell of that type this turn, that creature enters the battlefield with an additional +!/+1 counter on it

Something like Sensei's Divining Top can make sure you draw instants and sorceries for your turn plus some kind of sacrifice outlet to use the demon each turn, and make room for a new one would go a long way too