Hazel of the Rootbloom (BLC) $23.66 Hazel of the Rootbloom heads the Squirreled Away Commander precon, which is looking like the most popular out of the gate
Mox Sapphire Unlimited Price: $16,800 Another of the coveted Mox stones, the Mox Sapphire has the advantage of producing blue mana, the color that gets the most synergy from artifacts
It turns life directly into mana, and that exchange has broken formats before
Nightbound (If a player casts at least two spells during their own turn, it becomes day next turn.) Illustrated by Marta Nael Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
10 Commons or uncommons 2 Cards of each color 1 Multicolor, artifact, or common or uncommon land 1 Rare or mythic rare 1 Future Sight frame card There is a 60% chance for a rare or mythic rare
Previously Banned/Restricted Cards in Common Formats I'm not aware of any official list specifically composed for this purpose, but there are other sources that more or less specific for this purpose will help with the search: Scryfall (a third-party card search engine) added a custom search tag for Spike-tutorable cards
