I need some help, I need action that:

1. Equip Garlic Neckless if 3 monsters (Serpent Spawn, Medusa, Hydra)

2. Close BPs, Open MainBP -> Garlic BP and then open DP and take Garlic neckless inside Garlic DepotBP,
(Bp in bp in bp etc. with neckless) (need it to take 19~ so i allways have 19 after eveyr refill, so pbly i need to put an action of ammount in setup??????