The rule at the time was you should play your cards as written, and as written, you could discard or mill a Rukh Egg and still get the 4/4 token, which led to the card being banned before Wizards eventually updated the wording
Rose Tyler + The Tenth Doctor I could go very deep into the doctor and doctors companion cards, but this pairing is by far the most common, and one of the strongest

Akoum Stonewaker Altac Bloodseeker Ash Zealot Axgard Cavalry Battle Cry Goblin Bloodfeather Phoenix Bloodthirsty Adversary Casey Jones, Jury-Rig Justiciar Crimson Mage Cunning Coyote Devoted Duelist Draconautics Engineer Earthshaker Khenra Emberheart Challenger Feldon, Ronom Excavator Fugitive Codebreaker Generator Servant Goblin War Buggy Goro-Goro, Disciple of Ryusei Jeering Instigator Kraza, the Swarm as One Lightning Mauler Loyal Apprentice Magda, the Hoardmaster Minotaur de Force Moku, Meandering Drummer Nest Robber Oxidda Daredevil Prompto Argentum Prowcatcher Specialist Raccoon Rallier Rage Weaver Ravenous Robots Reckless Pyrosurfer Red Herring Resilient Roadrunner Robber of the Rich Smelt-Ward Ignus Sokenzan Smelter Speed, Young Avenger Speedway Fanatic Spellbinding Soprano Spider-Punk Summon: Brynhildr Valley Dasher Viashino Lashclaw Viashino Sandscout Warren Torchmaster
2002 First Edition Monster Reborn: $6,600 First-edition cards are a must-have for collectors
Retrieved September 29, 2009
Mammoth Spider is strong in a defensive green deck, but Id like to know thats the direction Im going before prioritizing one