Dr. Jane, The Obsessed

{t}, Sacrifice X humans you control: Create an
X/X Black Experiment creature token, where
X is the amount of humans sacrificed. It's an
Abomination with "Mutating this creature cost {3} less."
{5}{u}{b}: All Humans you control become a
copy of target Abomination you control until the
end of the turn. Sacrifice the targeted Abomination
at the end of the turn.