The problem at that point is the risk curve again. Every time you play a card that buffs another card, you increase the investment you've made in that one creature not only in quanta, but more importantly in cards drawn.
You have to sit back and honestly ask yourself: Why did I play all of those rage potions when I could have played 6 more phattie creatures?
THe thing that makes Rage Potion so awesome isn't that it can create huge, fragile attackers. It's that it's creature control that can ALSO be used to make huge, fragile attackers if you don't need it for creature control.
Much like Basilisk Blood is creature control that can ALSO be used to make one of your creatures damn near unkillable if you're willing to wait 6 turns to use it.
Combining 1 BB and 4 Rages on one creature nets you a single creature with +20 attack and no bonus to HP, which is awesome if the creature already had plenty of HP and your opponent isn't playing with Mutation/Fallen Elf, Freeze/Ice Shield/Arctic Squid, Rewind/Eternity, Parallel Universe, or, less usefully but still effective, any source of quickly building creature damage (Aflatoxin, Eagle's Eye, Fire Shield, Gravity Pull). That's 8 of 12 elements that has an appropriate response to such a creature, by the way.
There's just too damn many eggs in that basket!