I have to like Marshmallon as it has a nice effect of inflicting 1000 points of damage on top of not being destroyed. Coupled with Marshmallon Glasses, it can be a game changer and with it being semi-limited now it could be a threat to the meta game.
It is also quite durable as it can be used in any deck. It is a good piece of insurance when things are not going right for you in a duel or if you get a bad hand; we've all experienced that!!