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)
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
Swablu C - Peck 10 CC - Bind Wound Heal 30 damage from 1 of your Pokmon
(A creature with skulk cant be blocked by creatures with greater power.) Whenever a creature with skulk deals combat damage to one of your opponents, put a +1/+1 counter on The Master and draw a card
However, if the spell or ability to kill it has already been resolved, you cant regenerate anymore