Inalla, Archmage Ritualist — ruling 1

You can pay {1} only once each time Inalla's first ability resolves. You can't pay more to get more than one token.

Inalla, Archmage Ritualist — ruling 2

If Inalla enters the battlefield at the same time as other Wizards you control, its ability will trigger for each of those other Wizards.

Inalla, Archmage Ritualist — ruling 3

The token copies exactly what was printed on the creature and nothing else (unless that creature was copying something else; see below). It doesn't copy whether that creature was tapped or untapped, whether it had any counters on it or Auras and/or Equipment attached to it, or any non-copy effects that changed its power, toughness, types, color, and so on.

Inalla, Archmage Ritualist — ruling 4

If the copied creature had {X} in its mana cost, X is 0.

Inalla, Archmage Ritualist — ruling 5

If the copied creature was copying something else, the token enters the battlefield as whatever that permanent was copying.

Inalla, Archmage Ritualist — ruling 6

Any enters-the-battlefield abilities of the copied creature will trigger when the token enters the battlefield. Any "As [this creature] enters the battlefield" or "[This creature] enters the battlefield with" abilities of the copied creature will also work.

Inalla, Archmage Ritualist — ruling 7

If the creature that caused Inalla's ability to trigger has already left the battlefield by the time the ability resolves, you can still pay {1}. If you do, you'll create a token with the copiable values of the characteristics of that creature as it last existed on the battlefield.

Inalla, Archmage Ritualist — ruling 8

If a copied creature is legendary, any triggered abilities it has will trigger if appropriate before the "legend rule" causes one of those legendary creatures to be put into its owner's graveyard. Those abilities will be put on the stack after the "legend rule" is applied.

Inalla, Archmage Ritualist : règles, fonctionnement et interactions (MTG)

Inalla, Archmage Ritualist 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

Eminence — Whenever another nontoken Wizard you control enters, if Inalla is in the command zone or on the battlefield, you may pay . If you do, create a token that's a copy of that Wizard. The token gains haste. Exile it at the beginning of the next end step. Tap five untapped Wizards you control: Target player loses 7 life.

How it works : Inalla, Archmage Ritualist

Original English text — Wizards of the Coast / Scryfall

#1August 25, 2017· Wizards of the Coast
You can pay only once each time Inalla's first ability resolves. You can't pay more to get more than one token.
No other card is named in this ruling.
#2August 25, 2017· Wizards of the Coast
If Inalla enters the battlefield at the same time as other Wizards you control, its ability will trigger for each of those other Wizards.
No other card is named in this ruling.
#3August 25, 2017· Wizards of the Coast
The token copies exactly what was printed on the creature and nothing else (unless that creature was copying something else; see below). It doesn't copy whether that creature was tapped or untapped, whether it had any counters on it or Auras and/or Equipment attached to it, or any non-copy effects that changed its power, toughness, types, color, and so on.
Card named in this ruling
Copy
#4August 25, 2017· Wizards of the Coast
If the copied creature had in its mana cost, X is 0.
No other card is named in this ruling.
#5August 25, 2017· Wizards of the Coast
If the copied creature was copying something else, the token enters the battlefield as whatever that permanent was copying.
Card named in this ruling
Copy
#6August 25, 2017· Wizards of the Coast
Any enters-the-battlefield abilities of the copied creature will trigger when the token enters the battlefield. Any "As [this creature] enters the battlefield" or "[This creature] enters the battlefield with" abilities of the copied creature will also work.
No other card is named in this ruling.
#7August 25, 2017· Wizards of the Coast
If the creature that caused Inalla's ability to trigger has already left the battlefield by the time the ability resolves, you can still pay . If you do, you'll create a token with the copiable values of the characteristics of that creature as it last existed on the battlefield.
No other card is named in this ruling.
#8August 25, 2017· Wizards of the Coast
If a copied creature is legendary, any triggered abilities it has will trigger if appropriate before the "legend rule" causes one of those legendary creatures to be put into its owner's graveyard. Those abilities will be put on the stack after the "legend rule" is applied.
No other card is named in this ruling.
#9August 25, 2017· Wizards of the Coast
To activate Inalla's last ability, you may tap any untapped Wizards you control, including ones you haven't controlled continuously since the beginning of your most recent turn, such as Inalla itself. (Note that tapping the creature doesn't use [the tap symbol].)
No other card is named in this ruling.
#10August 25, 2017· Wizards of the Coast
This commander's eminence ability is a triggered ability. The commander must be on the battlefield or in the command zone as the trigger event occurs and also as the triggered ability resolves. If the commander is in an appropriate zone as the trigger event occurs but leaves that zone, the ability won't do anything as it resolves.
No other card is named in this ruling.
#11August 25, 2017· Wizards of the Coast
Notably, if your commander is on the battlefield and its eminence ability triggers, but it's put into the command zone before that ability resolves, that ability won't do anything as it resolves. This is because an object that changes zones is considered a new object.
No other card is named in this ruling.