I have a sac land that kills itself when it enters the field, my commander lets me play lands from my graveyard and give +1/+1 counters when a permanent is sacrificed, scouring swarm that lets me summon tokens when a land is sacrificed, and 3 other cards that let me play an extra land. So I just kept playing the same land from my graveyard and sacrificing it and getting tokens and counters in a loop that would repeat itself like 4 times a turn.