Im not sure that cost matters, especially when you can gain lore when it enters
Maximizing Fell Stinger requires sacrificing a creature to its exploit ability, but in return, you get to draw two cards at the cost of losing two life
If youre just going for mana fixing, I prefer something like Skyshroud Claim for my 4-mana investment
The first is that WotC put a lot of support behind Arena to reach a broad audience, and part of that is more MTGA-exclusive content including consistent ranked matches, best-of-one and best-of-three events
Giving you the ability to cast an instant or sorcery from your graveyard whenever you cast the opposite from your hand does a couple of unique things you can build off of
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