chimera card sleeves Sleeve Kings: Standard USA (57.5x89mm) although will fit smaller cards less snugly. Mayday Games 7044 Clear Sleeves

Generally speaking, Magical Stone Excavation is a bad card because you're trading 3 cards (itself, and the two you discard) for just 1 card back, costing you 2 cards in the process, although this isn't true for all cards since the card One for One (quite ironically, a 2 for 1) will always generate advantage, despite technically always costing you a card since you could potentially summon something like Glow-Up Bulb which can recur from the grave at no cost your hand or field, effectively replacing the card you discarded for One for One while also (going back to point 1) progressing your gamestate by helping you make easy Synchros

You could run Morophon as the commander of a Dragon deck, or as a means to play all the best Avatars, or Gods, or Elders in one place

While your opponents make what they think are fair trades, the second triggered ability turns you on to treasure and card advantage

Lugia VSTAR - worth $4 ungraded 2