Terraforming Mars can continue infinitely. The end state requires players to deliberately take the actions to reach it. If no player chooses to end the game,

Terraforming Mars can continue infinitely. The end state requires players to deliberately take the actions to reach it. If no player chooses to end the game, it never will. Players could continue forever to use engines that generate points each round, to unbounded totals. By game theory they shouldn't; eventually a player will be able to end the game while ahead and should do so; but we're already disregarding the motivation of winning for MTG. (An expansion introduces a rule that each round automatically advances one of the game-ending parameters, but says you can play either with or without that rule.)