Synchronized Spellcraft — ruling 1

If the target creature is an illegal target by the time Synchronized Spellcraft tries to resolve, the spell doesn’t resolve. No player is dealt damage.

Synchronized Spellcraft — ruling 2

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.

Synchronized Spellcraft — ruling 3

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.

Synchronized Spellcraft — ruling 4

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.

Synchronized Spellcraft : règles, fonctionnement et interactions (MTG)

Synchronized Spellcraft 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

Synchronized Spellcraft deals 4 damage to target creature and X damage to that creature's controller, where X is the number of creatures in your party. (Your party consists of up to one each of Cleric, Rogue, Warrior, and Wizard.)

How it works : Synchronized Spellcraft

Original English text — Wizards of the Coast / Scryfall

#1September 25, 2020· Wizards of the Coast
If the target creature is an illegal target by the time Synchronized Spellcraft tries to resolve, the spell doesn’t resolve. No player is dealt damage.
No other card is named in this ruling.
#2September 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.
#3September 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.
#4September 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.