Ive included a package of cycling lands (Lonely Sandbar, Fiery Islet, and Forgotten Cave) because your deck can use the extra draw and its a little mana flood insurance
Wizards of the Coast also previously announced that original cards from the 1994 set Legends will be hiding in Collector booster packs, which leaves an opportunity to open some extremely rare cards in you're lucky
Stone of Erech - While I dont think this is necessarily an upgrade on Soul-Guide Lantern or Relic of Progenitus, it does get points for shutting down creatures entering graveyards
Blue-Red Big Noncreatures Cast massive spells for massive value with a blue-red deck
When you cast this spell, you gain control of target opponent during that players next turn
I had my non-Magic-playing friend attempt to find various formats I gave them the name of, and they were able to navigate the site easily and efficiently