Nerfing those 3 cards is gonna be a big mistake, atleast the way you want to nerf it. Those 3 cards are the reason Preparation is viable. It became viable after Decrepify's rework to give ammo. Decrepify should be left untouched becuz nerfing it also affects preparation. Debilitate and poisoner are the real issue. Without Deb, poisoner or poison bolts in general, is not a big deal of an ability after the nerf of its in-built caut. Victory rush has been in the game for a long time. Nerfing it will also be the death of prep. The solution to tuning down the burst of Debilitate is simple:-
*Debilitate- Remove bonus 25% dmg entirely.
*Poisoner- Add a 15s internal cooldown.
Honestly Debilitate is what needs to be nerfed, not her cards. Like andro has 2 CD reduction cards for his nether step with his Q being full reset and RMB being 5s, so nerfing the scale of his Q from 15/75% and his abyssal touch to 0.8/4s would kill him. So nerfing the scale of both 3 cards would kill the rest of her talents while making Skye nothing but a dmg dealer. She might often be played as a dmg dealer, but she can easily confirm kills on backline champs unlike most dmg dealers who take more time and positioning to do so. Nerfing the scale of poisoner that heavily will change her role to a dmg dealer while her other talents are left out as a meme.
https://mypaladins.com/player/15336755/potatosnlper Im using this link and my skye matches to prove Preparation is still good and not low tier like what most of u say after the nerf on preparation(Im not using this link for a show-off but to prove my point). Adding internal cooldown to poisoner and removing the dmg bonus on debilitate will be the best move without killing skye completely.
Adding grapple hook would be a terrible idea becuz skye has to decide whether to use it as an escape tool or a flanking tool. Also both her stealth abilities are pretty important to her kit, Hidden is good flanking while Smoke bomb is good as an escape or as a tool to fool the enemy to make them think you are inside and waste their time. Skye doesnt need a rework to her kit. She needs a rework to all of her talents. Preparation needs a glorified version of victory rush+unlimited ammo integreted into it(and nerf victory rush to balance it out+rework decrepify into lifesteal) while Debilitate should be replaced with old smoke & daggers and the healing version of it with Surprise attack. Given she has no mobility, being the only flanker in the game to kill someone other than tanks with burst by herself would be balanced as Hidden and smoke screen has a fairly long cooldown and she cant abuse the burst unlike with debilitate.