Flying adrenalined druidic staffs heal for twenty. And I'm pretty sure that's a cheaper combo to get out. So it's really not that much healing.
You can't have more than 1 mount in play at a time, so I don't know why you are mentioning Parallel Universe and Fractal...The is 1 card that can heal for up to 15 per turn. Empathetic bond is 1 card that can heal for up to 23 per turn.
But this card can be killed with damage spells, frozen, lobotomized, mutated, eaten by otyugh...Empathetic bond's weaknesses are steal, deflag, Pulverizor, thunderstorm, and rain of fire, and plague