Grants a 25% chance to fire a tear with a Steven-like appearance that inflicts enemies hit with the multi-euclidean effect for 8 seconds.
Multi-euclidean enemies will cause tears that hit them to pass through and split into two parallel tears, similar to the effect of Multidimensional Baby.
Chance to fire a Multi-euclidean tear scales with luck, and reaches 100% chance at 15 luck.
Notes
Once a tear has been doubled, it cannot be doubled again by hitting another multi-euclidean affected enemy.
Unlike Multidimensional Baby, tears that pass through multi-euclidean enemies won't have extended range.
Bombs placed by Isaac that make contact with multi-euclidean affected enemies will be doubled.
Interactions
Mom's Knife: Enemies hit by the knife can be inflicted with multi-euclidean - however, knives that hit or are thrown through multi-euclidean enemies will not be split.
Dr. Fetus: Enemies hit by the explosions from Dr. Fetus bombs can be inflicted with multi-euclidean. Dr. Fetus Bombs that pass through multi-euclidean enemies will be doubled.
Epic Fetus: Enemies hit by the explosions from missiles won't be inflicted with multi-euclidean.
NOTE: The explosion not applying the effect on enemies is a result of a bug; however, Time Itself currently would not have any real effect with Epic Fetus missiles anyway.
Brimstone / Technology / Technology 2 / Tech X: Lasers have a chance to inflict multi-euclidean on enemies, and lasers will be split when passing through multi-euclidean enemies.
Aquarius: Creep puddles can gain a black color and have a chance to inflict enemies damaged by the creep with multi-euclidean.
Multidimensional Baby: Tears that pass through multi-euclidean affected enemies can be split again by passing through Multidimensional Baby, and vice-versa.
Dark Arts: Dark Arts has a chance to inflict multi-euclidean to enemies hit by the item's attack.
Abyss: Absorbing Time Itself spawns a unique Steven-like Abyss Locust that has a chance to inflict enemies hit with multi-euclidean.
Second Hand: Extends the duration of the multi-euclidean effect to 16 seconds, and adds another 8 seconds for every additional Trinket Multiplier.
Video Showcase
Trivia
Time Itself is a reference to Steven, who themselves originate from the 2009 flash game Time Fcuk created by Edmund McMillen.
Similar to the effect of Lodestone, Dogma and its television will glitch out and appear fuzzy when under the effects of multi-euclidian.
Steven-like appearance that inflicts enemies hit with the multi-euclidean effect for 8 seconds.
Multidimensional Baby.
Bombs placed by Isaac that make contact with multi-euclidean affected enemies will be doubled.
Mom's Knife: Enemies hit by the knife can be inflicted with multi-euclidean - however, knives that hit or are thrown through multi-euclidean enemies will not be split.
Dr. Fetus: Enemies hit by the explosions from Dr. Fetus bombs can be inflicted with multi-euclidean. Dr. Fetus Bombs that pass through multi-euclidean enemies will be doubled.
Epic Fetus: Enemies hit by the explosions from missiles won't be inflicted with multi-euclidean.
Brimstone / 
Technology / 
Technology 2 / 
Tech X: Lasers have a chance to inflict multi-euclidean on enemies, and lasers will be split when passing through multi-euclidean enemies.
Aquarius: Creep puddles can gain a black color and have a chance to inflict enemies damaged by the creep with multi-euclidean.
Dark Arts: Dark Arts has a chance to inflict multi-euclidean to enemies hit by the item's attack.
Abyss: Absorbing Time Itself spawns a unique Steven-like Abyss Locust that has a chance to inflict enemies hit with multi-euclidean.
Second Hand: Extends the duration of the multi-euclidean effect to 16 seconds, and adds another 8 seconds for every additional 
Trinket Multiplier.
Lodestone, 
Dogma and its television will glitch out and appear fuzzy when under the effects of multi-euclidian.
