I was playing around, in the trainer, with a new deck. I used played a horned frog, played a basilisk blood and an adrenalin on it, a few turns later I used an acceleration on it, and when it attacked it hit the opponent for 5 twice and on the third attack healed him for 3.
I guess it is because of how adrenalin scales the damage.
Here is the deck if you want to test it out.
55k 55k 55k 55k 55k 55k 562 562 562 595 595 595 595 595 595 5bs 5bs 5bs 5bs 5bs 5bs 5bs 5bu 5bu 5bu 5bu 5c7 5c7 5c7 5c7