Enchant creature
Enchanted creature has "Cumulative upkeep ." (At the beginning of its controller's upkeep, that player puts an age counter on it, then sacrifices it unless they pay its upkeep cost for each age counter on it.)

"The Lord of the Wastes must be destroyed; I am bound to this destiny by the chains of fate. If only Gerrard would see his part." —Sisay, journal