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Or so you want that new Chaos Dragon Ritual Blue-Eyes (Ritual Summon) Deck New Card Usage: 5/5 Deployment Power: 4/5 The Toughest!: 5/5 The Invincible!: 5/5 The Unbeatable!: 5/5 ATK: 5/5 Crush the opponent with powerful new Ritual Monsters

You are mostly playing them to improve your mana curve after all

As to the original question, considering the above: I personally like custom cards, but only if done well

Now, the vast majority of Doctor Who MTG cards are worth under $5

While the Gengar VMAX full art card from Fusion Strike continues to climb to obscene heights in terms of value, this LC Gengar is no slouch in that area