Rule 700.8 · General

If a spell, ability, or effect needs to determine the number of creatures in a player’s party, the calculation of that number is performed automatically by the game and results in a number between zero and four. Players don’t declare which specific creatures they control are in their party for such an effect.

If a creature has multiple creature types for which it could be the party member, it is counted as the party member for only one of those types. If there are different ways to count such a creature that results in different numbers of creatures in a player’s party, it is counted in such a way to get the highest result.

A player has a full party if there are four creatures in that player’s party.

One card, Stick Together, instructs players to choose a party from among creatures they control. To do so, for each of the creature types listed in rule 700.8, each player chooses up to one creature they control of that type.