At the beginning of your upkeep, put a lore counter on Worldstone Chamber. Then if there are ten or more lore counters on it, you win the game.

{1}{W}{U}{B}, Remove a lore counter from Worldstone Chamber: Exile target creature. Its controller creates a 1/1 token that is a copy of that creature.

{1}{W}{U}{B}, Remove three lore counters from Worldstone Chamber: Take an extra turn after this one.

{3}{W}{U}{B}, Remove five lore counters from Worldstone Chamber: Target player loses half their life, rounded up.