monarch booster box 1st edition – Case (4 Boxes, Sealed) and constructed formats. Flesh and Blood TCG: Monarch

You could also use it for #10 above, by the by, and if you did go wide, could I suggest Battle Cry as a good follow up

C Common Magician's Valkyria X LIGHT Level 4 [ SpellcasterEffect ] ATK 1600 DEF 1800 Monsters your opponent controls cannot target face-up Spellcaster monsters for attacks, except this one

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I assume it would as 0 XP is still a value and could therefore be reduced (even though it wouldn't make a difference as there is no negative XP cost)

Fairy Tale Cinderella Type: Spellcaster/Effect Level: 4 Attribute: LIGHT/ ATK: 1800 DEF: 1500 Effect: When this card declares an attack: It gains 200 ATK until the end of the Battle Phase