Plexiglass risers, Styrofoam blocks, or BCW Card Storage Boxes to make steps for your cards
One of the most important cards in the archetype, Wind-Up Shark, was designed entirely with this purpose in mind, as it allowed players to go for different XYZ monsters depending on what the board state called for
3D Protect Toploaders 3D Protect are not well known, but i was honestly impressed with the quality of their top loaders after testing them, especially when you consider a box of 25 only cost me 7
At 2500 Attack Points, it's not too hard to overpower, but its other effect means that it can be used as Fusion Material for itself unless players can banish it
It's wonderful for slowing aggressive plays and gives you a massive mana advantage when targeting big creatures