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Ive excluded [casthaven]Gemstone Caverns[/casthaven] (which essentially lets you turn being on the draw to being on the play), [casthaven]Urborg, Tomb of Yawgmoth[/casthaven], and [casthaven]Vesuva[/casthaven] since they dont produce multiple mana (but can when combined with lands on this list)

BT4-017 SR Digimon Lv.5 RizeGreymon Color Red Cost 8 DP 7000 Digivolve Cost 1 RedYellow 3 from Lv.4 Form Ultimate Attribute Vaccine Type Cyborg Card Text 1 [Effect] [Your Turn] This Digimon is also treated as yellow

Its also great in formats that have indestructible artifact lands

Until the end of this turn, increase this card's Pendulum Scale by that number (max

In fact, I would be surprised if there was a Constructed format that Dark Confidant didn't see play in...outside of Pauper, of course

Its one of those cards that gives hints of a chilling story, as well their being a stylish addition to their decks