I do like U/G Merfolks chances on becoming a breakout deck after Rivals of Ixalan releases, but Kumena, Tyrant of Orazca isnt the reason why and I expect it to be a small role player in the strategy with little chance for overlap into other strategies
This size has remained unchanged since 1996 and matches the standard poker card format used across most trading card games
Theres also a deep lore layer for those who want it, but you can ignore that and just enjoy the tight mechanics
In EDH, dealing 2 damage to everybody each time you play an instant or sorcery is huge, and players wont be too keen on spending removal on your guy
This effect cant reduce the mana in that cost to less than one mana
Its uniqueness, rareness, and power all make for the most valuable card in Edge of Eternities