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It also gives you a way to scry and trigger its own ability

Each Mystery Booster: Convention Edition booster pack contains fifteen cards: fourteen from the gigantically awesome main set, and one from that "something new and surprising" group of R&D Playtest cards.

These are not necessarily stronger than other rarities (although they can be) when it comes to the card game, but they are harder to come by when opening packs

It doesn't get much more explosive that than

Custom card makers and proxy sellers often use the set symbol as a fun way to make their cards unique and to differentiate the card from one printed by Wizards of the Coast

That said, there could be room in the format for a mono-green deck with Nissa and Nykthos