Light/Dark Nat 5 Summoning Chance Changes for Com2us

Im sure there is a lot of qqing about the chance of summoning a Light and Dark Nat 5, and myself, it's been 1100 day played and no Nat 5, but im not here to measure dicks.

I suggest Summoners War to implement a gradual increase in chance every summon that resets once you've gotten a Nat 5. This could be applied to all Nat 5s (but I'm particularly butt-hurt about l/d) and could be as gradual as Com2us likes. A 0.01% chance increase every summon, would mean every 100 summons would increase your chances by 1%. Blizzard does something similar with Legendary cards in hearthstone and it works great.

I can't see any reason everybody wouldn't benefit from this design, but what are your thoughts?