If your plan involves milling yourself, though, I can see it being useful, since it can be cast if you mill it over yourself
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Among them are Geralf and Gisa from Innistrad, Satoru Umezawa from Kamigawa, and Eriette from Eldraine
Instant Color tag templates(None) Drown in the Loch Choose one Counter target spell with mana value less than or equal to the number of cards in its controller's graveyard
Each spell also adds an additional red mana, letting you chain multiple cheap spells together to build an enormous pool in a single turn
They are points that may not be obvious for someone not familiar with these products, like many of the points already mentioned, but clear signs for someone who knows what the actual products look like