Blitzcrank with Seraph's Embrace think about that...
And suppose he gets Frozen Heart and Banshee's Veil as well...
*finger pyramid of evil contemplation*
Passive: When Blitzcrank's life is brought below 20% health he activates Mana Barrier, creating a damage shield that lasts for 10 seconds. The shield strength is equal to 50% of Blitzcrank's current mana. - 60 second cooldown
(Upgraded from Archangel’s Staff when fully charged)
+60 Ability Power
+10 Mana Regen per 5 seconds
UNIQUE Passive – Insight: +(3% of Maximum Mana) Ability Power
UNIQUE Active: Drains 25% of your current mana to shield yourself for an equal amount for 2.5 seconds - 120 second cooldown.
Passive Unique: +20% cooldown reduction
Unique: Nearby enemies suffer −20% attack speed. (1000 range)
+50 magic resistance
Passive Unique: Blocks one negative spell every 45 seconds.