BLOATED TOAD fucks up your early game by forcing you into playing 2 LAKES.
I ran HELLFIRE instead of MESSAGE IN A BOTTLE for a long time. But that doesn't really support the game plan of getting down the big stats your opponent isn't able to deal with. And as HELLFIRE isn't a creature you even waste bargains not buffing our beloved ILLUSIONS. 9 random damage for 7 also barely ever provides any value when used for board clears.
MESSAGE IN A BOTTLE might seem like a weird choice at first glance but its actually quite nice for thinning out the deck while also offering the potential to OTK with ILLUSION by taking advantage of MAGIC CARPET. The other treasures can help to deal with specific board states. That can be quite helpful as the only vanilla combat trick we have is MIRROR PHANTASM. SHIFTING TIDES can be used instead of MESSAGE IN A BOTTLE if you're really desperate for excess to movement tricks early on in a match or if you don't own the Chronicles of Gagana DLC.
You could sneak in GARUDAN instead of a FARM BOY, BALLOON FISH, DANCE or BARGAINER as well. But i tested several different versions of this deck for many many games and while GARUDAN can sometimes represent the perfect answer, the impact of its gift ends up being quite underwhelming way more often, making you wish you didn't waste one of your precious bargains on a creature that doesn't buff the ILLUSION.
I had big success running this on ladder. Missing out on collections early on can be ok if that enables a better management of your hand for bargain lines. Works kinda similar to RY Angry or GY Sacrifice.