Why collectors care Shadowless sits in the middle on rarity, more scarce than Unlimited, easier than First Edition
Card collecting is hobby that spans centuries, with the first known trading cards appearing in the 17th century
Mastering Energy is about understanding its role at every level of the game
With Hexavus, instead of reloading only by exiling the little Tetravites buzzing around everywhere, you can tap Devoted Druid to make a green mana then untap it, use that mana to pay for Hexavuss second ability (and in the process removing the -1/-1 counter from the Druid), and repeat
Whenever you target an opponent, their stuff, or even something in their graveyard, you can pay to look at the top two cards of your library, keeping the best one and tossing the other to your graveyard