Magic Fingers 
Effects
- Uses 1 coin to deal damage to all enemies in the room.
- (Removed in Repentance) Damage dealt is equal to twice Isaac's damage.
- (Added in Repentance) Damage dealt is twice Isaac's damage +10.
Notes
- This item becomes more valuable once Shops stop appearing.
Synergies
- (Added in Repentance)
Book of Virtues: Spawns wisps in the inner ring, looking like coins. The wisps have a chance to drop coins when destroyed.
- (Removed in Repentance)
Isaac's Heart + (Added in Afterbirth †)
Schoolbag +
IV Bag: Allows for effectively infinite uses by switching to IV Bag when low on money, with Isaac's Heart preventing it from lowering the player's health.
Interactions
- (Added in Afterbirth)
Car Battery: No effect.
- (Added in Repentance)
Ipecac: Damage boost is mostly ignored.