I see this card being a sweet inclusion to Orzhov Lifegain lists like Karlov of the Ghost Council, Ayli, Eternal Pilgrim, and Regna, the Redeemer & Krav, the Unredeemed, decks that can properly use their own life totals as a resource to exploit (hello, Aetherflux Reservoir)
Flamehold Grappler Im scared of what Flamehold Grappler can do with mechanics like plot, or foretell and the like in other formats
However, if the spell or ability to kill it has already been resolved, you cant regenerate anymore
Once the planeswalker lands, you might cast more colorless spells to add more removal, but its plenty good to just kill a threat so Ugin sits around drawing cards
Benjamin, entranced by the marriage of Dark Souls and Magic: The Gathering, found himself drawn deeper into the story that continues to unfold with every game