A Traditional Foil card of any rarity replaces a Common in 33% of Unfinity Draft Boosters
FromTheShire: On paper, this could make you tons of mana even if it's a bit expensive to cast it, and Elf is both a great type and something that is already built to have mana sinks to use said mana
Demonic Counsel A demonic tutor that literally becomes Demonic Tutor once you have delirium is both clever and actually fairly good

Rarity: S Cost: XR Card Type: Sorcery Name: Planequake Finish: Regular Set Name: Mystery Booster Playtest Cards Related Products Command the Chaff (No PW Symbol) Mystery Booster - Convention Edition Playtest Cards NM-Mint, English 1 In Stock NM-Mint, English 1 In Stock NM-Mint, English 1 In Stock Puresteel Angel (No PW Symbol) Mystery Booster - Convention Edition Playtest Cards NM-Mint, English 1 In Stock NM-Mint, English 1 In Stock NM-Mint, English 1 In Stock You're In Command (No PW Symbol) Mystery Booster - Convention Edition Playtest Cards NM-Mint, English 1 In Stock NM-Mint, English 1 In Stock NM-Mint, English 1 In Stock Bucket List (No PW Symbol) Mystery Booster - Convention Edition Playtest Cards NM-Mint, English 1 In Stock NM-Mint, English 1 In Stock NM-Mint, English 1 In Stock Yawgmoth's Testament (No PW Symbol) Mystery Booster - Convention Edition Playtest Cards NM-Mint, English 1 In Stock NM-Mint, English 1 In Stock NM-Mint, English 1 In Stock Five Kids in a Trenchcoat (No PW Symbol) Mystery Booster - Convention Edition Playtest Cards NM-Mint, English 2 In Stock NM-Mint, English 2 In Stock NM-Mint, English 2 In Stock

The thing with that, though, is that it was a deck with three five-color commanders that just featured a lot of two and three colored cards