65 x 90.5 mm card sleeve Swan Premium Sleeves (65x90mm) - 100 Pack, Thick Sleeves Ultimate Guard card sleeves: Precise-Fit

While most Spirit monsters are not members of an archetype, a few Spirit monsters belong to the "Ice Barrier" ("Sacred Spirit of the Ice Barrier") and "Gishki" ("Gishki Natalia" and "Emilia") archetypes, both of which exist in the Duel Terminal card storyline

You list it, agree on a price, and either ship it or meet locally

The 4 MV of Marsh Flitter is rather rough for a 1/1 creature, but you do get the added benefit of creating two 1/1 Goblins

Price Trends & Market Outlook OP-09 card prices have settled into a stable range after the typical post-launch correction, and several indicators suggest the floor is solid