I’ve just spent 950 crystals, and 170k (I think?) runes on Kiora.
So I can confidently say that Kiora is RIDICULOUSLY overpowered, and should be nerfed immediately.
She has access to the fastest mana in the game in green, and the best card draw AND removal in blue. Nissa’s Pilgrimage/Fertile Ticket/Natural Connection accelerate your cards out of your hand, and Jhessian Thief/Sigiled Starfish/Prism Array/Artificer’s Epiphany/Coastal Discovery/Any number of other cards fill your hand up again for minimal cost. God forbid you have access to Day’s Undoing, that’s a combo which is too powerful to be allowed to exist.
She combines all this fast mana with an inexpensive first ability which gives her even more mana, while simultaneously draining her opponent!
Playing blue gives her access to bounce, still the strongest form of removal in the game, which copes better with Hangarback Walkers than simply destroying them, and can easily deal with Undergrowth Champion, far and away the most broken creature in the game right now. And she can play Undergrowth Champion herself.
And she need not devote any space in her deck to a win condition, since her ultimate ability will do the job (unlike, say, Ajani, or Jace)… and quickly, as well.
Shame on anybody who has bought her and is happily playing away with a 100% win rate without bringing her extreme brokenness to the dev’s attention. If Ajani needed a nerf before the last update, and Chandra needed one before that, and Jace needed one before that, and Gideon needed one before that, then Kiora UNQUESTIONABLY does now, and has done for a long time.
Clearly, being able to play more than one color of cards is a huge advantage to a planeswalker in this game. Surely, then, they should be handicapped by having lower mana gains than normal, and abilities with less raw power. Consider the difference between Gideon’s ‘Sharp Eyes’ and ‘Call to Arms’ abilities… Sharp Eyes is low on power, but provides a situationally useful abilty which combines well with many White creatures and spells, whereas ‘Call to Arms’ gives you a very high return on power and toughness per loyalty spent.