If this card is in your hand or GY: You can target 1 "Lunalight" card you control, except "Lunalight Yellow Marten"; return it to the hand, and if you do, Special Summon this card in Defense Position, but banish this card when it leaves the field. If this card is sent to the GY by a card effect: You can add 1 "Lunalight" Spell/Trap from your Deck to your hand. You can only use each effect of "Lunalight Yellow Marten" once per turn.
Here are the cards you can search with Lunalight Yellow Marten’s effect. Lunalight Fusion is the in-archetype fusion spell and can be used for graveyard setup and triggering Lunalight’s effects. Lunalight Reincarnation Dance searches for 2 Lunalight monsters from your deck.