Expel from Orazca — ruling 1

If you have the city’s blessing and choose not to put the target nonland permanent on top of its owner’s library, it’s returned to its owner’s hand.

Expel from Orazca — ruling 2

Once you have the city’s blessing, you have it for the rest of the game, even if you lose control of some or all of your permanents. The city’s blessing isn’t a permanent itself and can’t be removed by any effect.

Expel from Orazca — ruling 3

A permanent is any object on the battlefield, including tokens and lands. Spells and emblems aren’t permanents.

Expel from Orazca — ruling 4

If you cast a spell with ascend, you don’t get the city’s blessing until it resolves. Players may respond to that spell by trying to change whether you get the city’s blessing.

Expel from Orazca — ruling 5

If you control ten permanents but don’t control a permanent or resolving spell with ascend, you don’t get the city’s blessing. For example, if you control ten permanents, lose control of one, then cast Golden Demise, you won’t have the city’s blessing and the spell will affect creatures you control.

Expel from Orazca — ruling 6

If your tenth permanent enters the battlefield and then a permanent leaves the battlefield immediately afterwards (most likely due to the “Legend Rule” or due to being a creature with 0 toughness), you get the city’s blessing before it leaves the battlefield.

Expel from Orazca : règles, fonctionnement et interactions (MTG)

Expel from Orazca is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.) Return target nonland permanent to its owner's hand. If you have the city's blessing, you may put that permanent on top of its owner's library instead.

How it works : Expel from Orazca

Original English text — Wizards of the Coast / Scryfall

#1January 19, 2018· Wizards of the Coast
If you have the city’s blessing and choose not to put the target nonland permanent on top of its owner’s library, it’s returned to its owner’s hand.
No other card is named in this ruling.
#2January 19, 2018· Wizards of the Coast
Once you have the city’s blessing, you have it for the rest of the game, even if you lose control of some or all of your permanents. The city’s blessing isn’t a permanent itself and can’t be removed by any effect.
No other card is named in this ruling.
#3January 19, 2018· Wizards of the Coast
A permanent is any object on the battlefield, including tokens and lands. Spells and emblems aren’t permanents.
No other card is named in this ruling.
#4January 19, 2018· Wizards of the Coast
If you cast a spell with ascend, you don’t get the city’s blessing until it resolves. Players may respond to that spell by trying to change whether you get the city’s blessing.
No other card is named in this ruling.
#5January 19, 2018· Wizards of the Coast
If you control ten permanents but don’t control a permanent or resolving spell with ascend, you don’t get the city’s blessing. For example, if you control ten permanents, lose control of one, then cast Golden Demise, you won’t have the city’s blessing and the spell will affect creatures you control.
No other card is named in this ruling.
#6January 19, 2018· Wizards of the Coast
If your tenth permanent enters the battlefield and then a permanent leaves the battlefield immediately afterwards (most likely due to the “Legend Rule” or due to being a creature with 0 toughness), you get the city’s blessing before it leaves the battlefield.
No other card is named in this ruling.