Unclear if Ichor Wellspring is a bit too slow for Standard but seems like it should be good enough
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Why didn't they make it
Jerren, Corrupted Bishop / Ormendahl, the Corrupter There are better ways to manage the sacrifice creatures, lose life, gain cards, gain life, repeat structure of black decks, but Jerren, Corrupted Bishop is one of the more flexible versions of that
Also buffing your other legendary creatures is a nice bonus too I suppose
This is especially great with Sliver Queen since you can sacrifice the tokens the Queen makes