A complete Destined Rivals master set contains 426 cards 244 main set and secret rare cards plus 182 reverse holos (one for each Common, Uncommon, Rare, and Double Rare)
Skeletal Scrying The downside of eating your graveyard to draw cards is maybe worse in black than any other color
Not only does this cost 1 mana less than its counterparts in Chandra's Ignition and Waltz of Rage, but you can also cast it a second time while refreshing your hand
Partner (You can have two commanders if both have partner.) Whenever another permanent you control enters, if it wasn't put onto the battlefield with this ability, you may put a permanent card with equal or lesser mana value from your hand onto the battlefield
These decks thrive on unpredictable effects, random outcomes, and board states that always look like your cat decided it's time to take its hourly stroll across the table