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that is, mechanics that only work with other cards that share said mechanic

You can only use each effect of "Asteria of the White Woods" once per turn

R Rare Pitch-Dark Dragon X DARK Level 3 [ DragonUnionEffect ] ATK 900 DEF 600 Once per turn, during your Main Phase, if you control this card on the field, you can equip it to your "Dark Blade" as an Equip Spell Card, OR unequip the Union equipment and Special Summon this card in face-up Attack Position

Y'shtola, Night's Blessed is definitely one of the best Esper commanders, period

Theres also a whole bunch of great searchers such as Spellbook of Secrets and Spellbook Magician of Prophecy

Blaine, Brock, Erika, Giovanni, Koga, Lt