Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to a creature may become lethal if Eye of Nidhogg becomes attached to it or unattached from it during that turn
Arc-V has become one of my favorite Yugioh animes since it doesn't disappoint
Tidus, Yunas Guardian has the ability to move a counter from any target creature onto another target creature, and hes also got the unique Cheer ability, which allows him to draw cards and proliferate whenever one or more creatures (that the player controls) deals combat damage
Also, the materials are technically not on the field while attached, so any effects that activate when leaving the field are not triggered when the material is detached from an XYZ monster
Wait, what
9 Kahili (Full Art) $31.08 A Swing And A Hit Kahili is the first Alolan Trainer to burst onto the scene in Lost Thunder, setting the tone for a parade of incredible full-art cards to come