It deals 30 more damage for every Dark Energy attached to the card, which can be significant in the middle to late stages of a Pokemon match
Alejandro takes a crack at building a Pauper Commander deck around the newly revealed Shantotto, Tactician Magician from Final Fantasy
Ground Seal turns off Snapcaster Mage, Deathrite Shaman, Unburial Rites, Seance, and part of Angel of Serenity
Once Wizards started a second print run in North America, the base set was broken up into Shadowless (for the first run) and Unlimited
For example, Obosh, the Prey Piercer can only be used as the companion of decks that exclusively feature spells with odd-numbered mana costs, and Yorion, Sky Nomad can only be used as the companion for decks featuring 20 more cards than the minimum for their format