SkekTek's Machine

{2}, {t}: Target opponent sacrifices a creature they
control, then you create an Essence Vial token
with X essence counters on it, where X is equal
to the sacrificed creature's toughness. (It's an
artifact with "{t}, Sacrifice this artifact: Target
creature gets a +1/+1 counter for each essence counter
on this artifact; or you gain life equal to the number
of essence counters on this artifact.")
If an opponent sacrifices a Gelfling, create an
Essence Vial token with twice that man