This is a bad idea.
This would create a cheaper and buffed version of the Lava Destroyer rush again, since one +2 growth puts it into the sweet spot to rise to 15 attack. Considering it was the game's strongest rush, I don't think we really want it back and better than before, with the ability to also throw rage potions at them to speed up the rush process as they grow.
This deck would also allow for, if it still healed to 15 health with over 15 attack, a PVP seraph OTK using 8 cards, something we don't need more of:
Seraph + Nature + Rage Pot + Rage Pot + Nature (raises HP back to 15) + Rage Pot + PU + Sky Blitz
(12+3+6+6+6)*2*2= 132 damage, killing standard nonbuffed players. Immortal them. The next turn hits for 66 damage 198 health, killing any deck with less than 200 health. Immortal them. Final hit kills anything left over. Using a max health reducing shard or spell like fireball at some point in the setup means that the second hit is an ensured kill.
Fairly strong combo, and though hard to set up, it is unstoppable once in motion without a shield. It is also a cheaper rush than Limitless speed OTK.