Predecessor Builds > Countess > DPS Prophecy Countess

Countess that utilizes the F out of prophecy. Prophecy provides 32 additional attack speed from the passive hasty alone, and adds over 100 magical dmg on basic attacks through the passive magical strikes.
Furthermore, Spirit, Timewarp and Astral Catalyst will provide enough mana sustain. High ability haste and timewarp means ability spamming, Astral Catalyst means Ult spamming. In general very high DPS.
Build is pretty much countered by magic armor, so if enemy team is very tanky or builds heavily into that, consider building pen instead of Astral catalyst.