Champion Concept: Melantha, Oracle of Targon

So I hatched a concept for a vision based support. I haven't really tackled her lore yet, only that she is blind, an Oracle of the highest esteem on Mt. Targon, and prone to a darker, more aggressive augury. Without further ado, I present Melantha, Oracle of Targon.

Passive: Mark of Targon - Whenever Melantha deals magic damage to an enemy with her spells or attacks, that unit receives a Mark of Targon. For 3 seconds, the next time that unit takes damage, the mark is consumed and they are dealt magic damage.

Q: Blood Scry - Melantha hurls her shiv at target enemy. A hit unit takes magic damage, and then bleeds for 3 seconds for a percentage of their remaining HP (Bleeding does not trigger the Mark). While bleeding, the unit is revealed.

W: Omen of Targon -Melantha summons a ward that last for 45 seconds. Whenever an enemy comes within close proximity to the ward, the ward detonates, dealing magic damage to all in a small radius.

E: Visions of Despair - Melantha projects visions of a bleak future to a target foe. For 2.5 seconds, whenever the foe attacks, the cool downs of their spells on cool down is increased by 1 second.

R: Omniscience - Passive: Whenever Melantha casts a spell, she gains true sight for 1.5 seconds. Active: Melantha reveals the entire map for 1.5 seconds. Enemy champions receive a Mark of Targon.

Please tell me what you think!