You may look at and play that card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast that spell. Illustrated by Tomas Duchek Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Legal Comp
Sure, it might stretch the definition of what a Goblin is, but it has to qualify, as both sides of this card produce a Goblin creature, either in token form on the front or as a zero-mana-value enchantment creature on the backside
Casting Cost: Card Text: Each player secretly chooses a number 0 or greater, then all players reveal those numbers simultaneously and determine the highest and lowest numbers revealed this way
Vampiric Tutor is one of the best tutors in the game, Relentless Assault is one of the best extra combat phase cards, Necromancy is a good reanimation spell, and Natural Order is a great way to tutor a big Green monster directly to the battlefield
Aim for a single-EX deck (so no Charizard-Moltres or Arceus-Dialga) and get the second copy as soon as possible to maximise the chances of getting one in the starting hand