Infinity Force 7018since 11.9.1 9 changes removed in 14.13.1
3333g (0g base, 2333g sell)
Threefold Strike: Attacks grant 25 Move Speed for 3 seconds. If the target is a champion, increase your base Attack Damage by 6% for 3 seconds, stacking up to 5 times (Max increase 30% AD).
Spellblade: After using an Ability, your next Attack is enhanced with an additional (200% base Attack Damage) physical damage On-Hit (1.5s cooldown). Mythic Passive: Grants all other Legendary items 3 Attack Damage, 3 Ability Haste, and 3 Move Speed
Builds from: 
Trinity Force
HealthDamageAttackSpeedCooldownReductionOnHitNonbootsMovementAbilityHaste
Click any two patches to compare; the current range is shaded.
+ Basic attacks grant movement speed.
− After using an Ability, your next Attack is enhanced with additional damage.Mythic Passive: Grants all other Legendary items Attack Damage, Ability Haste, and Move Speed.
+ After using an Ability, your next Attack is enhanced with additional physical damage.
− Basic attacks grant movement speed.
+ Basic attacks grant Move Speed.