When Normal Summoned, "Sage with Eyes of Blue" can search any Level 1 LIGHT Tuner monster, or can Discard itself to Special Summon "Blue-Eyes White Dragon" from the Main Deck, and is a key card of both the "Blue-Eyes" and "with Eyes of Blue" archetypes.
"Dragon Spirit of White" also has a Synchro Monstercounterpart called "Blue-Eyes Spirit Dragon", who prevents both players from Special Summoning two or more monsters at the same time, locking down most Pendulum-based Decks. It also has the ability to negate any effect that would activate in the Graveyard once during either player's turn.
"Blue-Eyes Spirit Dragon" can also can Tribute itself to Special Summon any LIGHTDragon-Type Synchro Monster. The Synchro Monster must be used as a Material for another Summon or be able to protect itself to avoid being destroyed at the End Phase.
"Dragon's Mirror" is recommended for the Fusion Monster "Neo Blue-Eyes Ultimate Dragon". While it is the only face-up card you control, it can attack multiple times in the same Battle Phase, and at the same time, able to send and use other copies of "Neo Blue-Eyes" from the Graveyard to protect any "Blue-Eyes" monster(s) from being targeted by effects.
The "Blue-Eyes" deck can easily make use of this dangerous monster due to its ease of summoning the various "Galaxy-Eyes" Xyz monsters, and Rank 8 Xyzs in general. When you have two "Blue-Eyes" monsters on the field, Xyz Summon any "Galaxy-Eyes" Monster; then, Xyz Evolve that monster into "Galaxy-Eyes Full Armor Photon Dragon", which can detach an Xyz Material to destroy any card. After that, Xyz Evolve that monster into "Number 95: Galaxy-Eyes Dark Matter Dragon". If you can resolve this play early enough into a game, this can set up many "Blue-Eyes" Monster combos from the Graveyard, especially when combined with cards such as "The White Stone of Ancients" or "White Stone of Legend" to generate hand advantage (with Stone of Legend) or End Phase field advantage (with Stone of Ancients).
If running "Red-Eyes Darkness Metal Dragon", Banish the first "Dark Matter Dragon" on the Field and use the effect of "Metal Dragon" to Special Summon the first "Galaxy-Eyes" Xyz Monster to Chaos Xyz Change into "Full Armor" and then "Dark Matter Dragon" to repeat the combination and effects twice in the same turn. This combination requires one or two "Full Armor Photon Dragons" and two "Dark Matter Dragons" in the Extra Deck, so it is not recommended to run this and "Neo Blue-Eyes" in multiples.