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shuffle it into the Deck, then, you can Set 1 "Infinite Machine" directly from your hand or Deck

Warping Wail is the least reliable removal spell but has the added options of being a counterspell for sweepers and card-drawers like Painful Truths and Treasure Cruise, or ramp spells like Explosive Vegetation

Keldon Necropolis costs too much to use, it should cost 2 mana, that makes it prohibitive, but it's a useful ability

While there are cheaper options in mono-black like Raise Dead, Fell Horseman gets the edge in my opinion by also being a creature you can play later if needed

Fringe archetypes like four-color legends in Pioneer rely on Mana Confluence to be able to cast their spells on curve

Some builds of Regigigas chose to focus more on techs like Shuckle GX (GX)