Does the Guppy transformation stack with the Mulligan

the-binding-of-isaac-rebirth

When you transform into Guppy you get an effect similar to the Mulligan item: when you deal damage, there is some chance of a blue fly spawning. If I become Guppy and get the Mulligan, do they together have a higher chance of spawning blue flies than individually?

Best Answer

From Rebirth Wikia:

Isaac turns into his cat Guppy after picking up any three of the following items. In this form, Isaac gains flight and will produce blue flies every time an enemy is hit with a tear.

Otherwise, Mulligan "grants an infestation shot with a 1/6 chance of spawning allied blue flies when tears hit an enemy".

So in my opinion they can't stack, because being Guppy already grants a blue attack fly on each hit done.

EDIT:

I know we are talking about Rebirth, but in the previous version of the game, according to the original Wikia:

Once transformed, Isaac will gain flight and an enhanced version of The Mulligan, which always spawns Attack Flies when he or his familiars' tears strike an enemy.

If they could stack it would mean that you can spawn more than an attack fly, but as the old Wikia states, "you can't spawn two flies with one shot".

In the previous version of the game they didn't stack. And I have no evidence to think they have changed that.