ゴイフの祭壇
部族・アーティファクト — ルアゴイフ
あなたがコントロールしているクリーチャーが単独で攻撃するたび、ターン終了時まで、それは＋Ｘ/＋Ｘの修整を受ける。Ｘはすべての墓地にあるカードの中のカード・タイプの種類数に等しい。
あなたがコントロールしているすべてのルアゴイフ・クリーチャーはトランプルを持つ。
「何かが死ぬと（判読不能）が育つ」 ――石像に鉤爪で刻まれた言葉
イラスト：
Modern Horizons 2#220アンコモン日本語適正
裁定
Tribal is a card type that allows noncreature cards to have creature types. Altar of the Goyf is a Lhurgoyf (although not a creature) while on the battlefield, and a Lhurgoyf card (although not a creature card) in zones other than the battlefield.
A creature attacks alone if it’s the only creature declared as an attacker during the declare attackers step (including creatures controlled by your teammates, if applicable). For example, Altar of the Goyf’s first ability won’t trigger if you attack with multiple creatures and all but one of them are removed from combat.
The card types that can appear in a graveyard are artifact, creature, enchantment, instant, land, planeswalker, sorcery, and tribal. Legendary, basic, and snow are supertypes, not card types; Aura and Lhurgoyf are subtypes, not card types.
If Altar of the Goyf somehow becomes a creature and the effect allows to keep its other types, it will give itself trample.