Acts
WARNING!
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Act 1: Exordium
You can never get an upgraded card without 
Molten Egg, 
Toxic Egg, or 
Frozen Egg.
Bosses
Elites
Events
Regular events: Full List
Big Fish, The Cleric (only with at least 35 Gold), Dead Adventurer (floor 7 or above), Golden Idol, Living Wall, Hypnotizing Colored Mushrooms (floor 7 or above), Scrap Ooze, Shining Light, The Ssssserpent, Wing Statue, World of Goop
Shrine events: Full List
An event can be a shrine 25% of the time.
Bonfire Spirits, The Divine Fountain (only if cursed), Face Trader, Golden Shrine, Lab, Match and Keep, A Note For Yourself (never appears on Daily Climb runs or on Ascension
15 +), Ominous Forge, Purifier, Transmogrifier, Upgrade Shrine, We Meet Again!, Wheel of Change, The Woman in Blue (only with at least 50 Gold)
Act 2: The City
Card rewards have a 25% chance each to be upgraded.
Bosses
Elites
Events
Regular events: Full List
Ancient Writing, Augmenter, The Colosseum (only above a guaranteed Treasure Room), Council of Ghosts, Cursed Tome, Forgotten Altar, The Library, Masked Bandits, The Mausoleum, The Nest, Pleading Vagrant, Old Beggar (only with at least 75 Gold), Vampires
Shrine events: Full List
An event can be a shrine 25% of the time.
Bonfire Spirits, The Divine Fountain (only if cursed), Designer In-Spire (only with at least 75 Gold), Duplicator, Face Trader, Golden Shrine, The Joust (only with at least 50 Gold), Knowing Skull (only with more than 12 HP), Lab, Match and Keep, A Note For Yourself (never appears on Daily Climb runs or on Ascension 15 +), N'loth (only with 2 or more Relics), Ominous Forge, Purifier, Transmogrifier, Upgrade Shrine, We Meet Again!, Wheel of Change, The Woman in Blue (only with at least 50 Gold)
Act 3: The Beyond
Card rewards have a 50% chance each to be upgraded.
Bosses
Elites
Events
Regular events: Full List
Falling, Mind Bloom, The Moai Head (only with 
Golden Idol or when at 50% or less HP), Mysterious Sphere, Sensory Stone, Tomb of Lord Red Mask, Winding Halls
Shrine events: Full List
An event can be a shrine 25% of the time.
Bonfire Spirits, The Divine Fountain (only if cursed), Designer In-Spire (only with at least 75 Gold), Duplicator, Golden Shrine, Lab, Match and Keep, A Note For Yourself (never appears on Daily Climb runs or on Ascension 15 +), Ominous Forge, Purifier, Secret Portal (only if 800 or more seconds have elapsed in the run) Transmogrifier, Upgrade Shrine, We Meet Again!, Wheel of Change, The Woman in Blue (only with at least 50 Gold)
Act 4: The Ending
Act 4 cannot be accessed unless the player has collected all 3 Keys. If these conditions are met, Act 4 will begin right after beating the Act 3 Boss.
Bosses
Elites
Events
There are no Events in Act 4.