Mom's Wig

Effects

Isaac now spawns friendly Blue Spiders when firing tears.
Heals Isaac for 1 red heart upon pickup.
(Added in Afterbirth) This item belongs to the Yes Mother? set. Collecting three items from this set will transform Isaac into his mother.

The spiders are spawned when Isaac is shooting, and up to 5 spiders can be spawned at the same time. More spiders can be spawned if the previous ones died.
The spider spawning chance depends on the luck stat and goes up to 100% with 10 Luck.
(Removed in Repentance) This item does not work for Lilith since (Added in Afterbirth) Incubus tears do not count as her tears.
Spiders can still be spawned in rooms without enemies.

(Removed in Afterbirth †) Brimstone / Chocolate Milk / Cursed Eye / Mom's Knife / Monstro's Lung / (Added in Afterbirth) Tech X: Charging an attack spawns spiders in rapid succession.
Epic Fetus / The Ludovico Technique / (Added in Afterbirth) Marked: Moving the tear/crosshair around will spawn spiders rapidly.
(Added in Afterbirth †)(Fish Tail) Fish Tail: Doubles the total amount of spiders that can be spawned at the same time, up to a total of 10.
Hive Mind: Doubles the limit to 10 spiders, in addition to boosting the damage of spiders per the item's base effect.