First thing that comes to mind? Lax gets a hard counter in the form of Jellicent. Ofc jelli won't be doing anything back to him since there is no will-o-wisp, poison does nothing to rest lax, but it's neutral to EQ, and is immune to all 3 of it's normal stabs it runs. Resists both surf and blizzard on amnesia sets as well. Jelli has RECOVER which alone makes it an extremely indispensable mon. Tauros also has nothing to hit jelli with hard enough (assuming no crit on his EQs).
Zapdos/Jolteon would undoubtedly see a rise in order to counter it and perhaps slowbro as well since Jelli can't threaten him at all (no taunt in gen1) and he could just amnesia his way up until Psychic destroys.
Probably a lot of other changes and effects would be seen to this, but I'm too lazy to think of all them right now. I do think it'd undoubtedly be used in OU regularly though.
Zapdos/Jolteon would undoubtedly see a rise in order to counter it and perhaps slowbro as well since Jelli can't threaten him at all (no taunt in gen1) and he could just amnesia his way up until Psychic destroys.
Probably a lot of other changes and effects would be seen to this, but I'm too lazy to think of all them right now. I do think it'd undoubtedly be used in OU regularly though.