Card not found is an underappreciated card that can make Delirium decks tick by putting two types into the graveyard at instant speed
So, let's start there: Top 10 Non-Creature, Non-Land Permanent Repeatable Loot Effects For Hashaton or Captain Howler Mask of MemoryMask of Memory Daretti, Scrap SavantDaretti, Scrap Savant Teferi, Master of TimeTeferi, Master of Time Key to the CityKey to the City Hazoret's MonumentHazoret's Monument Collector's VaultCollector's Vault Smuggler's CopterSmuggler's Copter Shorikai, Genesis EngineShorikai, Genesis Engine Mirrodin BesiegedMirrodin Besieged Chivalric AllianceChivalric Alliance While that's not the deepest pool of good options I've ever seen, there are still some options here

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Prerelease Goodies For The New Set In addition to getting packs from playing and for doing well in this Prerelease event series, players who participate in a Prerelease event may secure themselves a crystalline 10-sided spindown die (while supplies last)
Sakura-Tribe Elder can synergize with decks that care about creatures, especially creatures dying
I thought Id take a second to look at how well I predicted the power level of various cards