OP01-051-eustasscaptainkid-701 is a defensive option that pairs well with the plethora of blockers in the deck, as opponents will have to target him instead of your leader
Some helpful tips: To end up with your full ideal endboard you'd typically need these 3 cards in hand/field (Sombre, Pollux/Leonis, Zubeneschamali), so what cards you decide to pitch into the GY with your skill with depend on how you want to accomplish this, e.g.: Rasalhague + Sombre: pitch Zubeneschamali and Leonis in the GY Sombre + Pollux/Leonis: pitch Zubeneschamali and Rasalhague in the GY Pollux is an activated effect when normal summoned and Leonis a persistent effect as long as Leonis is face up on the field, be careful of this when doing your summons When going first, it's possible to activate Star Chart twice to draw twice if you summon Pleiades, draw from Star Chart, return Star Chart to hand and reactivate, then summon a second Constellar XYZ
Zirda, the Dawnwaker is a very important utility card as it reduces the mana cost of activated abilities
OP-03 is out of print in both JPN and EN
Wish When I started putting together this list, Wish seemed like a no-brainer