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Darksteel Mutation Exxaxl: This might seem like a weird pick to some, but completely strip your best creature of anything it can do can be an incredibly impactful play on an opponent's board state

1 | Gontis Aether Heart Price: $12 The most expensive Energy-related card in Magic is currently Gontis Aether Heart

Once you do, Mindwrack Demon becomes amazing, since it actually tends to get you to delirium instantly (or very quickly)

In short, every granted effect is going to get you ahead, especially when you can untap all your Lands and cast another few spells

However, effects based on any additional costs that were paid for the original spell are copied as though those same costs were paid for the copy too