Rod of Ages 6657since 12.22.1 12 changes
2800g (215g base, 1960g sell)
Eternity: Restore Mana equal to 7% of premitigation damage taken from champions, and Health equal to 25% of Mana spent, up to 20 Health per cast, per second. For every 200 Health or Mana restored this way, gain 35% Decaying Move Speed for 3 seconds.Mythic Passive: Grants all other Legendary items 5 Ability Haste.
Builds from: 
Blasting Wand
Catalyst of Aeons
Amplifying Tome
Builds into: 
Infinite Convergence
HealthHealthRegenSpellDamageManaManaRegenCooldownReductionAbilityHaste
Click any two patches to compare; the current range is shaded.
− Taking damage from champions restores 7% of the damage as Mana. Casting an ability heals for 25% of Mana spent.
+ Taking damage from champions restores 10% of the damage as Mana. Casting an ability heals for 25% of Mana spent.
− This item gains 10 Health, 20 Mana and 3 Ability Power every 60 seconds up to 10 times. Upon reaching max stacks, gain a level.
+ This item gains 10 Health, 30 Mana and 3 Ability Power every 60 seconds up to 10 times. Upon reaching max stacks, gain a level.