Dark Ascension

{b}, Pay 2 Life: Put an Ascension Counter on
Dark Ascension
As long as there are 5 or more Ascension
Counters on Dark Ascension, it has "Sacrifice a creature: add {c}{c}"
As long as there are 10 or more Ascension
Counters on Dark Ascension, it has "At the beginning of
your endstep, each player sacrifices a creature."