Archpriest of Iona — ruling 1

The ability that defines Archpriest of Iona's power applies in all zones, not just the battlefield.

Archpriest of Iona — ruling 2

Archpriest of Iona's power is constantly updated as the number of creatures in your party changes. If Archpriest of Iona is on the battlefield, it will consider itself as a Cleric.

Archpriest of Iona — ruling 3

The last ability won't trigger at all if you don't have a full party as your combat phase begins. It won't grant +1/+1 or flying if you don't have a full party as it resolves. The number of creatures in your party may change between these times, however.

Archpriest of Iona — ruling 4

Once the target creature gets +1/+1 and gains flying, it keeps those bonuses even if you no longer have a full party later in the turn.

Archpriest of Iona — ruling 5

To determine “the number of creatures in your party,” check whether you control a Cleric, whether you control a Rogue, whether you control a Warrior, and whether you control a Wizard. The number is the total number of those checks to which you answered yes. Each creature you control can be counted for only one of those checks.

Archpriest of Iona — ruling 6

If a creature has more than one party creature type, and there are multiple ways to count that creature that could result in a different number of creatures in your party, the highest such number is used. For example, if you control a Cleric and a Cleric Wizard, the number of creatures in your party is two. You can't choose to have it be just one by counting the Cleric Wizard first as a Cleric.

Archpriest of Iona — ruling 7

An ability referring to the number of creatures in your party gets a number from zero to four. Such abilities never ask which creatures are in your party, and you never have to designate specific creatures as being in your party. You can't choose to exclude creatures from this count to lower the number.

Archpriest of Iona — ruling 8

Some cards refer to you having a “full party.” This is true if the number of creatures in your party is four.

Archpriest of Iona : règles, fonctionnement et interactions (MTG)

Archpriest of Iona 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

Archpriest of Iona's power is equal to the number of creatures in your party. (Your party consists of up to one each of Cleric, Rogue, Warrior, and Wizard.) At the beginning of combat on your turn, if you have a full party, target creature gets +1/+1 and gains flying until end of turn.

How it works : Archpriest of Iona

Original English text — Wizards of the Coast / Scryfall

#1September 25, 2020· Wizards of the Coast
The ability that defines Archpriest of Iona's power applies in all zones, not just the battlefield.
No other card is named in this ruling.
#2September 25, 2020· Wizards of the Coast
Archpriest of Iona's power is constantly updated as the number of creatures in your party changes. If Archpriest of Iona is on the battlefield, it will consider itself as a Cleric.
No other card is named in this ruling.
#3September 25, 2020· Wizards of the Coast
The last ability won't trigger at all if you don't have a full party as your combat phase begins. It won't grant +1/+1 or flying if you don't have a full party as it resolves. The number of creatures in your party may change between these times, however.
No other card is named in this ruling.
#4September 25, 2020· Wizards of the Coast
Once the target creature gets +1/+1 and gains flying, it keeps those bonuses even if you no longer have a full party later in the turn.
No other card is named in this ruling.
#5September 25, 2020· Wizards of the Coast
To determine “the number of creatures in your party,” check whether you control a Cleric, whether you control a Rogue, whether you control a Warrior, and whether you control a Wizard. The number is the total number of those checks to which you answered yes. Each creature you control can be counted for only one of those checks.
No other card is named in this ruling.
#6September 25, 2020· Wizards of the Coast
If a creature has more than one party creature type, and there are multiple ways to count that creature that could result in a different number of creatures in your party, the highest such number is used. For example, if you control a Cleric and a Cleric Wizard, the number of creatures in your party is two. You can't choose to have it be just one by counting the Cleric Wizard first as a Cleric.
No other card is named in this ruling.
#7September 25, 2020· Wizards of the Coast
An ability referring to the number of creatures in your party gets a number from zero to four. Such abilities never ask which creatures are in your party, and you never have to designate specific creatures as being in your party. You can't choose to exclude creatures from this count to lower the number.
No other card is named in this ruling.
#8September 25, 2020· Wizards of the Coast
Some cards refer to you having a “full party.” This is true if the number of creatures in your party is four.
No other card is named in this ruling.