Tribal deck strategies rely on synergies between cards of the chosen tribe, in this case, Elves
You people are the reason many new players see the player base as toxic. Wizards has attempted to keep the sort of views rampant on r/freemagic out of the game at an official level
If you cast draw 3 like Harmonize, you will discard one, then draw, discard one, then draw, and discard one, then draw, resulting in you not generating card advantage
Theres no overarching strategy or theme that would use this best, but its still a super sweet card that many different casual Commander decks could put to use, and I hope to try it sometime after release
Of these 18 cards, 15 were part of the core series, while the other three were part of the Japanese series