The reports consider cards from different sets to be distinct (even if they have the same name), but do not distinguish copies sold by condition (Near Mint, Lightly Played, etc.) or by printing (Foil, etc.)
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
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
Find Selfless Spirit if youre worried about an opposing board wipe
But the finality counter can also be somewhat loosely interpreted for that heartbreaking plot twist