It can't be the target of spells or abilities, its static abilities have no effect on the game, its triggered abilities can't trigger, it can't attack or block, and so on
Kaito has a passive ability that lets you add loyalty counters to him anytime a creature you control deals combat damage to another player, letting you hit that -9 final ability faster
Whether it saves your life in combat, regenerates your commander, or counters a spell targeting you, youll always have something to do with this charm
Standard is also a format full of similar high-impact, bad-to-kill-after-resolving cards that are outside the range of Inquisition of Kozilek but are selectable with a cleaved Dread Fugue
A commander deck may want to play both since only a single copy of each card can be in the deck Also see our write up on colorless card draw cards (non-artifact)