(10/4/2019) If the target creature is an illegal target by the time Oko's second ability tries to resolve, the ability won't resolve
Even just having one Censor in your deck, and cycling it away on turn 1, sends a signal to your opponent to be cognizant of the card and to play around it for the rest of the game
There's a reason the old adage is "Bolt the Bird" rather than "Pacify the Elf." On top of this are more layers, usually also downsides: PacifismPacifism is vulnerable to a DisenchantDisenchant effect drawn at any point during the game, the creature's controller can bounce it back to their hand, and they can still use it to power some spells like Rabid BiteRabid Bite, or to sacrifice to cards like Village RitesVillage Rites
What Is a Triggered Ability in MTG
It also makes your creatures tougher to block without trading
If you get a large creature with the first cast, the following cast can be even more impactful