3 permanents for one card is fine? Explosion weeps.
Your incomplete argument sounds like you are unaware that cards also cost quanta and turns. Please don't forget to mention why you are ignoring the 2 other costs.
What is that incomplete? If you would be to play the game more, you would see that SoFo is quite overused and OP.
One bad part at SoFo is that it can do too many things in the same time, it can attack(Rage Potion, Acceleration), it can act as PC(obvious), it can act as denial(the BH after you use it) and can act as a form of defense(combined with GPull).
The other bad part is that it blows out of the water any other form of PC, in effectiveness.
Let's take the case when SoFo is not used with anything else and try to get other forms of used PC at the same level, with the mention that SoFo is weak in the first turn and requires a turn to get active.
Deflagration: You need 3 of those to get to SoFo power, so 9
quanta and 3 card slots.
Steal: You need 3 of those to get to SoFo power, so 12
quanta and 3 card slots, instead you get 3 permanents too.
Pulverizer: You need it and then 3 uses of Pulvy to get it to SoFo power, so 4
quanta, 9
quanta and 1 turn slot, but it's weak in all the turns and requires a turn to get active, also needing a duo to work.