Sylvia of the Last Bloom

Other nonartifact creatures you control have Calamity 1 and "{t}: Add {g} for each doom counter on this creature"(At the beginning of your upkeep, put a doom counter on this permanent. At the beginning of your end step, sacrifice it if it has three or more doom counters on it).
"This world is meant to die--fate decrees it. In our last moments on it, I refuse to profane the souls of my people with the unnatural hubris of artifice."