The fact that the pests Sedgemoor Witch makes synergize with life drain and lifegain effects like Dina, Soul Steeper make this black creature really good

Awaken the Erstwhile Balancing Act Chandra Ablaze Creeping Dread Cunning Lethemancer Dark Deal Delirium Skeins Dragon Mage Earsplitting Rats Enemy of Enlightenment Fanatic of the Harrowing Flux Gutmorn, Pactbound Servant Ill-Gotten Gains Incendiary Command Jace's Archivist Kardur's Vicious Return Kefka, Court Mage Largepox (playtest) Liliana of the Veil Liliana, Defiant Necromancer Liliana, Waker of the Dead Magus of the Jar Magus of the Wheel Marsh Crocodile Memory Jar Miasmic Mummy Mindlash Sliver Mindslicer Naktamun Lorespinner Neheb, the Worthy Rankle's Prank Rankle, Master of Pranks Reforge the Soul Rix Maadi, Dungeon Palace Rotting Rats Runehorn Hellkite Seek Bolas's Counsel (playtest) Sensation Gorger Serum Raker Sibsig Icebreakers Sire of Insanity Strategy, Schmategy Strongarm Tactics Stronghold Rats Wheel of Fate Wheel of Fortune Whispering Madness Windfall

Ill be showing some of the more valuable things we found through the seven packs, so you can get an idea of what might be inside a collector booster even if you dont get one of the lottery tickets of a serialized Eldrazi
It seems to be happening with time
A good set of 40 cards can provide countless combos and counters, so it's something you're going to want to get right from the outset, and as ever, we've got you covered