@protoaddict Imagine this with Thought Scour, it fuels itself and you get to draw and dig for Phoenix for very cheap.
In the other formats people are looking at its interactions with Rituals which is also quite scary. Not so much with Cabal ritual, very much so with rite of flames.
I know WOTC does not care about vintage and does not plan card designs around the format, but they have to know that is going to be restricted already right?
I can already see this getting banned in modern as well because Phoenix builds can abuse the hell out of it, and it may be better than past in flames in some decks in that format.
The only Delve spells I can think of you playing in this format are DDT and TC right? No one is running anglers out in vintage unless I missed a meeting.
Knowing that, I think it's perfectly reasonable to cut the 2 delve spells for 2 of these, since these can more than make up for the missing cards you would draw off them. I think I would rather have this and a demonic tutor in the yard to get the card I want than trying to get them with DDT, and would far rather be able to cast Ancestral 2+ times.
The stuff that gets hurt the most with this I think includes snapcaster, because you want your fuel in the yard, and Dredge, because if this becomes prominent then grave hate will become standard fair, maybe in the main deck.