Enter Oblivion

Cumulative upkeep- {2b} or sacrifice a creature at the beginning of each opponents upkeep, they sacrifice a creature for each age counter on this enchantment. Put an oblivion counter on this. When you choose to sacrifice this to cumulative upkeep, if it had 10 or more oblivion counters on it, search your library for Jenvayana, the Ultimate end and put it into play.