I've never built a Commander deck in those colors before
It seems like it just might be fast enough (of course those plays outlined above were of the optimal sort) that it may not need any Kraken Hatchlings, Isleback Spawns, counterspells or the like to help it get there, though you may never end up playing Jace's Ultimate because he'll probably take a lot of beats, but hey, that's almost the same as gaining life, and anyhow, once he's dead, you could very well have drawn into another one, so that works out too
The new, mutated creature will have the power and toughness of the top-most card and all of the abilities on every card that makes up the mutated creature
That enchantment was originally part of 1998's Stronghold set and can only be found in The List (a curated list of older cards that no longer appear in Play Boosters nowadays), making it rather hard to acquire unless you pay the circa $4 to buy it on some kind of marketplace
Striped Bears Bear power