Gouged Zealot — ruling 1

The card types that can appear in a graveyard are artifact, battle, creature, enchantment, instant, kindred, land, planeswalker, and sorcery. Legendary, basic, and snow are supertypes, not card types; Cyclops and Berserker are subtypes, not card types.

Gouged Zealot — ruling 2

Gouged Zealot's triggered ability checks whether there are four or more card types among cards in your graveyard to see if it triggers. If you don't, the ability won't trigger at all. The ability will check again as it tries to resolve. If you don't at that time, the ability won't do anything. The specific cards in your graveyard may change between the two checks.

Gouged Zealot : règles, fonctionnement et interactions (MTG)

Gouged Zealot 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

Reach Delirium — Whenever this creature attacks, if there are four or more card types among cards in your graveyard, this creature deals 1 damage to each creature defending player controls.

How it works : Gouged Zealot

Original English text — Wizards of the Coast / Scryfall

#1June 18, 2021· Wizards of the Coast
The card types that can appear in a graveyard are artifact, battle, creature, enchantment, instant, kindred, land, planeswalker, and sorcery. Legendary, basic, and snow are supertypes, not card types; Cyclops and Berserker are subtypes, not card types.
No other card is named in this ruling.
#2June 18, 2021· Wizards of the Coast
Gouged Zealot's triggered ability checks whether there are four or more card types among cards in your graveyard to see if it triggers. If you don't, the ability won't trigger at all. The ability will check again as it tries to resolve. If you don't at that time, the ability won't do anything. The specific cards in your graveyard may change between the two checks.
No other card is named in this ruling.