The black cards synergize perfectly with the new valiant creatures, which is why a black splash has become preferred over green or white
fifty times
Remember to make your card balanced, and look at Pokmon cards for inspiration
Odd-Eyes Rebellion Dragon Overlord X DARK Rank 7 [ Dragon / XyzPendulumEffect ] ATK 3000 DEF 2500 P Scale 4 Once per turn: You can Special Summon this card from your Pendulum Zone, then Special Summon from your Extra Deck, 1 "Rebellion" or "The Phantom Knights" monster, using this card as material (this is treated as an Xyz Summon), then you can attach 1 card from your Pendulum Zone to it as material
It either stays in the spot, or I dont get it
A 4/4 is fine, if a bit sad against Sheoldred, and its ability to Shock something whenever you cast a spell should be able to close out the game quickly, assuming you have some cards in hand