Think of it like an MDFC: Its a tapland on one side, or a nerfed Guttersnipe that draws your next land on the back
Since Strong Back is not a legendary artifact or land, once it's gone it's near impossible to bring back outside of a few cards
The rare collectible was presented to the executive to celebrate his 60th birthday
This is to say that, despite the cost that each draw minimally impacts the composition of the rest of the deck, this deck probably has better mana than a 60-card deck with one less color (Im not sure how problematic needing to fetch four colors instead of three will actually be to how games play out)
Although you have to lose the dork to kill a thing unlike Viridian Shaman you are not constrained by keeping it back until needed and are therefore able to curve out nicely with it
If the squids triggered upon leaving the battlefield instead of at death, Id say that it might compete with True-Name Nemesis in Legacy