Some include a physical or vocal component, like Blacker Lotus or the Gotcha! mechanic on Touch and Go, some have rules that specifically reference flavor text or artists, like Carnivorous Death-Parrot and Drawn Together, and some require interacting with people or objects outside the game (Ashnod's Coupon being my favorite)
This means while you can Link Summon Gaia Saber with any three monsters (each monster counting for 1 Link Rating), you can also Link Summon Gaia Saber using a LINK-2 monster (which has a Link Rating of 2) and one other monster (which adds to the Link Rating of 2 for a Total of Three)
It can also disable The One Ring, though you'll likely avoid this interaction since you run it, too
Trishula, Dragon of the Ice Barrier Trishula is an insanely powerful synchro monster, and easily one of the best dragons in Yu-Gi-Oh
WR: PILOT AGGRO In my experience RW has been by far the best pure aggro deck in the format, relying on a few specialized uncommons and the wealth of strong 2- and 3-drops in these colors
A Reckoning Approaches Scheme When you set this scheme in motion, look at the top six cards of your library