Revival items and trinkets grant Isaac "extra lives": they are triggered when he would otherwise die. When multiple revival items are available, the order they are checked in is always as follows:
Soul of Lazarus
1up!
Lazarus' inherent extra life- Dead Cat
- Lazarus' inherent extra life
- Inner Child
- Guppy's Collar
- Lazarus' Rags
- Ankh
- Broken Ankh
- Judas' Shadow
- Missing Poster
- Birthright (as Tainted Lost)
(This order does not apply as 
Keeper in Afterbirth. It may not apply universally.)
Pages in category "Revival items"
The following 10 pages are in this category, out of 10 total.