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While they read like niche color hate, the absurd efficiency of a one-mana counterspell/one-mana removal split card elevates this to an S+ sideboard card for red decks, and a mirror-beater for any blue deck capable of fetching Volcanic Island which is all of them

It nearly always trades up on mana, which is excellent efficiency that you dont usually get from cheap removal

cards in graveyard for mechanics like delve, escape, and delirium

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They go to their owners' graveyards after they resolve

Mask of Memory