Indivilia, the Reconstructor

Whenever another legendary creature enters the battlefield under your control, create X 1/1 black
Alva particle creature tokens, where X is that
creatures mana value
Whenever a nontoken creature dies, you may
sacrifice X other creatures, where X is twice that creatures mana value and create a token that is a
copy of that creature, except it is a non-legendary,
black Heretic in addition to its other types.
Heretic squad