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The upkeep cost of just one blue mana is trivial to pay

A Cat, Elemental, or Dinosaur tribal deck is probably going to want to play all Cats, Elementals, or Dinosaurs anyway, so the opportunity cost of playing Kaheera as your companion in such a deck is low

Id have happily played this if it only bounced permanents, but interacting with the stack makes this way stronger

3/2 Illustrated by Simon Dominic Standard Legal Alchemy Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp

Sure, if you have arbitrarily large mana or an arbitrarily usable blink engine, it will keep everyone from attacking always, but at that point, Stonehorn Dignitary isnt the problem