Bumbleflower: Mana Drain: And Rhystic Study, but the card is more than a year since release, so keep that in mind: For almost all of these, we can see that the price starts out high, and then takes a dip, and then rises into the stratosphere
As far as Magic Arena goes, there isn't really a way to get the deck cheaper than eight rares and four mythics since Dorothea, Vengeful Victim, Katilda, Dawnhart Martyr, and Hallowed Haunting are the foundations of the deck, although turning a rare dual land into Evolving Wilds does help with the cost a bit there as well
Elesh Norn isn't often a commander, though it's more popular in the deck of 99, and it's also a popular reanimation target in other formats such as Modern and, in years past, Standard as well
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