Great Card! Good choice of cost increase (you caught on pretty quickly!
), and welcome to CI&A!
I don't think this card should be immune to poison or ability damage, taking your argument from before, if a rabbit ate poisoned food, it would die too. If this card was made completley immune to all damage, then Gravity Pull, Antimatter, Lobotomize, and Paradox would be the only ways to counter it.
Otherwise, great idea with great art. The cost increase should balance it out well.