After set-rotation, each Ink colour will have a maximum of 45 cards per set (excluding Epic, Iconic and Enchanted you may want to store differently) meaning you can have four copies of all the cards from 2 or 4 sets in a single trove
Being zapped for two in order to play your lands untapped doesn't feel great, but shock lands are nonetheless a powerful land type, offering good flexibility
Detectives Phoenix is particularly explosive here, coming down as an Aura when cast via Bestow from the graveyard
Hapatras synergy with -1/-1 counters helps ensure you have the most creatures on play at all times, and since her Snake tokens have Deathtouch, they also serve as an excellent deterrent to opponents looking to exact retribution
By sacrificing a creature, you gain two generic mana, accelerating you to higher-cost cards ahead of your opponents