[1.19.4] How to detect if entity comes into existence

[a_random_something]

Is there an event to subscribe to or another way to run code only once whenever a wandering trader comes into existence from anything (natural, /summon, spawn egg, etc.)? I want to do a 1 in 20 chance whenever a trader spawns to give him a tag from my mod that makes him turn into another mob when you try to hit or trade with him

Edited November 25, 2023 by a_random_something

[LeeCrafts]

Subscribe to EntityJoinLevelEvent and check if that entity is a wandering trader.

Edited November 26, 2023 by LeeCrafts