This card is most notable for the fact the design instantly evokes a sense of familiarity and nostalgia
The perfect addition to any Hydra deck, Unbound Flourishing is a reasonably costed enchant that doubles the value of X in any permanents you cast with X in their cost
I sunk all of my free Magic Arena wild cards resources into a Boros Mentor deck, just to find out that the mechanic isnt all that great in constructed
You often want many creatures that mutate in the same deck to maximize the synergies, so Souvenir Snatcher doesnt go in just any deck
And while Arena can be a great way to introduce a new player to the online format, if they don't want to empty their wallets, they'll have to get used to losing for a while
If your table has the competitive mindset to embrace these powerful combos, their explosiveness makes them very much at home in the Commander format