Hi all. I see some contradiction in this two rullings.
1/19/2018 If there is no exiled card as Bishop of Binding’s last ability resolves, most likely because Bishop of Binding left the battlefield while that ability was on the stack, X is 0. The same is true if the exiled card doesn’t have a power, most likely because it’s a noncreature card that had become a creature.
1/19/2018 If a Vehicle is exiled with Bishop of Binding, use its printed power to determine the value of X.

&
CR: 301.7a Each Vehicle has a printed power and toughness, but it has these characteristics only if it’s also a creature.

Can somebody explain this?

Hi,

This is due to an incoming rules change with Rivals of Ixalan. From the Rivals of Ixalan Update Bulletin, written by Magic Rules Manager Eli Shiffrin: (https://magic.wizards.com/en/articles/archive/news/rivals-ixalan-update-bulletin-2018-01-11):

208.3

Until we printed Bishop of Binding, it never really mattered whether Vehicles had a power when they weren't on the battlefield. A literal reading of this rule would have also led you to conclude that creature cards not on the battlefield didn't have a power, either. I've modified this rule to let anything printed with a power and toughness have those values while not on the battlefield.

While we don't have the actual updated version of the Comprehensive Rules yet, this is a change that's being made.

Nathan Long
Magic Rules NetRep