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Chandra Heart of Fire sees unironic play in red prison, and this is considerably more powerful (if more fragile).

Imo this is an amazing card for a more aggressive black stompy with Rotting Regisaur, but is a poor fit for my deck.

busy beaver functions and TREE() grow much faster than up arrows

Forgot you are the controller of the damage. Best option IMO would be Soul-Fire Grandmaster+ intervention pact is infinite life.

Modern burn staple Deflecting Palm, as well as
Comeuppance
Honorable Passage

It could very well matter if they have a thassa's oracle in hand. But yah vs doomsday even an aven mindcensor is gg. The stealing is more relevant against cards that don't insta lose like crop...

You 100% can exile 5 cards from their library, exile their graveyard & library, and play the 5 cards you steal. Not sure if you can steal cards from their graveyard.

Per the rulings on Gonti, Lord...

Auto-Include in my deck. Absolutely destroys (like 3 for 1 or just straight up win the game) doomsday, goblin matron, recruiter of the guard, crop rotation, KOTR, stoneforge mystic, wishclaw...