The on-field effect was inspired somewhat by Super Rejuvenation, which I recognize is banned (well, in the TCG) but I figure if youre investing four monsters (and a Fusion Spell) into a card, its gotta help you generate some advantage and pay itself back
Tymna is a top commander choice because she has the Partner ability, which - like Tymna herself - was introduced in the Commander 2016 set
But the finality counter can also be somewhat loosely interpreted for that heartbreaking plot twist
It used to be the best, but also the most skill-intensive payoff creature Dredge had, but the card lost a lot of its power with the ban of Faithless Looting
Not only does it turn off the "legend rule" for your tokens, it also stops most of the abilities that force you to sacrifice your tokens
Being in Azorius also means full access to counterspells and pillow fort enchantments to protect what you are building