It's because kaleidosaurs are so easy to kill. I mean the second you play galvadon, there are numerous answers to immediately just kill it, with spellbreaker, silence (conditionally), or mass dispel and then kill it somehow because it's only a 5/5 now, or if it doesn't have can't be targeted by spells or stealth just shadow word: death, siphon soul, polymorph, if it does any mass removal like psychic scream, twisting nether, poison seeds.
Kaleidosaurs are really easy to kill and that's why all of them are dead except Galvadon.
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I love paladin quest, but I can assure that even though the getting reward is not worth the reward (still fun!), galvadon is pretty hard to remove. There have been less than twenty people who have ever silenced, devolved or destroyed my galvadon when it had stealth.