Politically, its difficult to know whether or not having a lot of Energy is good, let alone what number is dangerous, since other players arent sure how to value Energy as a resource
The farthest-away set we know about is a return to Arcavios , the plane where 2021s Strixhaven: School of Mages is based
For example, Meren of Clan Nel Toth looks at your graveyard on your end step and finds your favorite reanimation target or gives you a gravedigger effect
Id need a reason not to put this in a blue deck
Defiler of Flesh converts a single black pip on each permanent you cast into Phyrexian mana, which sounds great, but the cast trigger is pretty tame compared to something like Defiler of Vigor or Defiler of Dreams
Hraesvelgr takes this to heart with a prowess trigger that makes any one of your creatures unblockable