Having a way to consistently sacrifice the Warden is the key to making it amazing, so it will be strongest in decks with a heavy sacrifice theme like Athreos, God of Passage, Karador, Ghost Chieftain, and Teysa, Orzhov Scion
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
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
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)
If you had to be on the crew, which legendary pirate would you want as your captain