The Destined Black Mage
Deathtouch {B}, {T}: Another target creature you control gains deathtouch until end of turn. Whenever you cast a noncreature spell, The Destined Black Mage deals 1 damage to each opponent. If you have a full party, it deals 3 damage to each opponent instead.
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Official rulings (4) · Scryfall
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.
Some cards refer to you having a "full party." This is true if the number of creatures in your party is four.
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.
The Destined Black Mage's last ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered or otherwise leaves the stack.