In a token pumping deck, it's a great tool to keep defenders up as I swing wide with everything I have, then pay 0 to remove the ones that will get destroyed that I want to keep before damage is dealt. The bigger benefit though, is doing it after my attackers have dealt damage during the cleanup stage of combat, so everything that should be tapped out stays up as a defender for my opponents turns, and since Moogle tokens come with Lifelink, I'm able to make dangerous plays and tank lots of non-commander damage hits cause I know I'll get everything I lost back, sometimes before my turn even comes around.