For that of course the Ceremonial Duel Deck was probably the best candidate for this, taking under consideration the famous cards that go in triads (Magnet Warriors and the Three Knights
However, you can also acquire a UR jewel from level up rewards
A support card for the Guardian archetype sounds perfectly reasonable, but it however is slightly problematic with the way Yu-Gi-Oh handles archetypes
Opening the gates of chaos!" When Yugi Summons "Black Luster Soldier" (by any method), a cut-in frame of Yugi briefly appears, and he announces, "Bring forth Black Luster Soldier!" Most of the time when Yugi declares an attack with that monster, he announces, "Black Luster Soldier
This is most often used with "Blue-Eyes White Dragon," because of how easy it is to search in order to Deck thin and then activate "Trade-In" to get to your key plays faster
Deck List and Combo Example Due to the nature of Pendulum decks, there isn't really a set in stone starters for our combos, rather, try to reach cards that can advance the combo, which are namely Loading