While Ancestral Visions is obviously a gimme if you dont ban Treasure Cruise, thats probably not the world we live in
If you have cards that can get rid of its Depletion counters, like Hex Parasite or Solemnity, then it can become a total lock piece
On the one hand, it should be ok if a stall occurs in the Afterlife because it's just one of the two battlefronts
It's got a six-mana cost and then when it or other Allies arrive, we can Bolt a dork our Ally count
Once activated, it remains a creature for the rest of the game and counts as a Demon for Unholy Annex
Some abilities trigger each time a single card leaves, while others trigger only once per instance, regardless of how many cards leave at once