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The trigger event doesn't have to specifically refer to "creatures." In these cases, the trigger event may also refer to something being "put into a graveyard from the battlefield." For example, an ability that triggers "whenever an artifact is put into a graveyard from the battlefield" would trigger twice if an artifact creature dies while Teysa Karlov is on the battlefield

This is a hard rule, not a preference

While Ritual Monsters are Main Deck monsters that cannot be Normal Summed or Set, the difference is that Ritual Monsters do not summon themselves by their own effect like a Special Summon Monster does

Even so, this is a slam dunk for your tribal decks with its cheap equip cost and significant stat boost

Graded Population Report: Lucario V #27 Visualize the distrbution of grades in the chart