Two things make Guide of Souls good: first, its cheap mana cost and the additional resource it creates when it triggers make it on-par or better than our Soul Warden
Current MEGA-era Japanese booster boxes start at approximately $51 (7,500) on the secondary market
Tier B - Power With Limitations For tier B, you're looking at starter decks with cards that synergize pretty well together out of the box or ones that need minimal upgrades
Wear // Tear and Serenity is for permanent-based hate cards like Leyline of the Void and Grafdiggers Cage (I like having a split as Serenity is better against artifact decks like 8-Cast but Wear // Tear is a more efficient answer specifically for hate cards), and Massacre is for white-based hatebears
Unfortunately, if you missed The Pokmon Center's latest drop, then it's a waiting game for now
-3: Return target creature card from your graveyard to the battlefield