When summoned, Kaldra immediately equips all three of its signature items, resulting in a 9/9 indestructible, first strike, trample, haste monstrosity that can exile those it defeats in combat
That's eminently achievable for a standard dragon deck, and means the expensive dragons stuck in your hand early in the game are actually doing something useful
Evasive creatures also pair nicely with buffs from cards like Craterhoof Behemoth, or cards that grant infect like Triumph of the Hordes
While you dont get triggers from copying cards like Elder Deep-Fiend, sometimes a 5/6 is all you need
Shirahoshi alternate art is a must-have for yellow decks, offering essential blocking abilities
Four mana is an efficient price for six damage, and the life gain is just gravy