With a core of Fable of the Mirror-Breaker, Bloodtithe Harvester, Corpse Appraiser plus a suite of removal, permission and discard, its going to take a lot to break into this archetype
If your deck benefits from life gain but doesn't need it then any card in the cube with any life gain potential that you want in your deck has surprisingly higher value than you might think
That's really good, and 6 mana in Commander is mid to late game
I was reading recently about double-faced cards

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