Having your Oblivion Ring variant also be a creature aura might sound like a downside, but the ward it grants the creature should make this a bit less fragile than usual
I will talk about all this news on this weeks episode of the PokeBeach podcast, along with additional insight.
It cares about card types in a neat way, and secretly gets better and better as Wizards prints more black cards that allow you to sacrifice a creature or artifact
That downside isn't enough to knock this card off our list - because MTG sliver decks are heavily focused on creatures, this effect will always be worse for your opponents than it is for you
10 Crucible Of Worlds (Borderless, Surge Foil) Behold, The G.E.C.K
Food is an artifact subtype, so it's fair game to show up on artifact cards as well