Are these things problems with hearthstone?

devestations don’t count as spells cuz pressure plate wasnt triggered by one
necrium apothacary’s deathrattle triggers even after being returned to hand by freezing trap

also hidden oasis is too cheap for a 6/6 taunt for only six mana, and restoring 12 health for six mana is op, so obviously getting both at the same time is just rediculous.

Unless I’m missing something this has nothing to do with the web API.

If you wanna discuss or express your opinion over mechanics of the game itself a better place to do so is over the Hearthstone community discussion forums.