After fetching up our mana rocks, we are able to use the Pyre of Heroes to turn our Tribute Mage to perhaps an Archaeomancer, Venser, Sower of Temptation, or even Rishadan Footpad
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
You are mostly playing them to improve your mana curve after all
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
Armed Dragon LV3 X WIND Level 3 [ DragonEffect ] ATK 1200 DEF 900 During your Standby Phase: You can send this card to the GY