You get to put +1/+1 counters on it whenever you cast a creature, and since mutating counts as casting, you get to put a counter on your commander and grow it biggerto then cast more mutate spells
There are a lot of ways to maneuver through the stack to lessen the blow of party decks
(2013-06-07) You choose all targets for the spell after revealing cards you want to splice, including any targets required by the text of any of those cards
Inalla's ability also exiles the token, so copies of Corpse AugurCorpse Augur and Vindictive LichVindictive Lich won't trigger unless they're killed through other means
My siblings and I were avid collectors, and would play the game in official tournaments at Toys R Us
Even out of the box though, Bellos deck is very cute and pretty powerful, so that might be worth the price of entry alone