Use it when you want a single place to evaluate whether an item looks strong, weak, overextended, early, or simply active in multiple parts of the market
This mana can't be spent to cast nonartifact spells
You see, as it enters you can choose Artifact, Enchantment, Instant, Sorcery, or Planeswalker, and then nobody can cast those spells
One thing Ive learned after tracking tons of Magic card prices is that the American and European MTG markets are completely out of synch
Both use counter language
In fact, the sets were widely considered failures by the game's players and designers, which is weird, because for me they were, at the time and even today, the best sets available