Maggy's Faith

Maggy's Faith is an unlockable trinket.

Effects

The eternal heart is added directly to Isaac's heart containers, as opposed to appearing as a pickup.
The effect will also be triggered when the floor is reset (for example, with Forget Me Now).
Eden will not be given the eternal heart on the first floor if they start with this trinket.
When held as The Forgotten, the eternal heart will be given to whichever character is being controlled when entering the next floor.
When going though the Ascent, eternal hearts will be given for each floor traveled up.

Glowing Hourglass: Eternal hearts will persist if the item is immediately used on the next floor, allowing for another eternal heart for free.
Golden Trinket/Maggy's Faith/ Mom's Box: Each effect/trinket copy stacks granting one additional eternal heart at the start of every floor per stack with every pair of eternal hearts granted immediately giving Isaac a heart container.

Maggy's Faith is most likely a reference to Mary Magdalene's faith in Jesus. Mary was said to be one Jesus trusted most and she stayed with Him past the abandonment of His disciples, as well as being the first person He showed Himself to after His resurrection.^[1]
- It may also be a reference to Mom, with her name being revealed to be Maggy during the Ascent sequence.
"Faith's reward" may constitute a contraction of the adage "Faith is its own reward", although use of the word 'faith' in the game is conflicted, as it also used in the quote for the Rosary Bead, in reference to Angel Rooms.
This trinket is used in Baptism by Fire (challenge #38).