$10$50 (Mid-Range) Rhystic Study, Cyclonic Rift, Demonic Tutor, Smothering Tithe, Vampiric Tutor, Ad Nauseam, Teferi's Protection, Consecrated Sphinx, The One Ring, Bolas's Citadel, Thassa's Oracle, Drannith Magistrate, Seedborn Muse, Humility, Natural Order
Notably, opponents can't try to remove the conniving creature after you discard cards but before it receives +1/+1 counters, if any
total 17 2015 Border, "untap" + "permanent": Teferi, Temporal Archmage, Vizier of Tumbling Sands, Clever Conjurer, Nimbleclaw Adept, Ioreth of the Healing House, Forensic Researcher
The time you have to wait before you can open the Mystery Box again will be reduced during the event
This means Aven Courier can copy shield counters and pass them around the field, or one of the buff counters used by Denry Klin