If you sink enough mana into its X cost, your opponents will either die or have no resources left to defend themselves, both on the battlefield and in their hand
I still remember Ali Aintrazis legendary stream when he created a brew with this card and crashed MTG Arena with triggers
As a 4/4 flyer with infect, it can stack up poison on a single opponent fast, especially combined with his cheap haste-granting ability, particularly useful when Skithiryx is rising from the command zone multiple times a game
Paying three extra mana on your five drop isn't exactly the rip roaring tempo a cube aggro deck can get that exciting about
For example, a card with 1 ink cost would exert 1 ink from the inkwell
Chaos Orb incentivizes players to physically spread their cards out over a large area in order to minimize the possibility of multiple permanents being affected