This is like a much cheaper version of fractal for angels. Does it stack?
But it can be worse than fractal. Much worse. Especially if it stacks. Since it (seems to) include the opponent's turn, you'll probably be getting a clogged field nearly as fast as Malignant Cell
Yes, it stacks and includes the opponent's turn.
Basically, it's a Graveyard that doesn't let you mass-trigger it.
I like the comparison to Aflatoxin, even though this is slower (constant increase rather than exponential).
Being angels, with their high HP and useful(?) ability, is this overpowered?