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Of the more popular ones, Card of Safe Return provides extra digging every time Jar is revived, Level Limit protects the Jar player while they assemble the combo, and Rock Bombardment grants immediate access to Jar should you have a Shallow Grave

On the mana side, fetch lands are some of the most expensive cards here

Coruscation Mage AND Stormcatch Mentor This uncommon two-drop PEZ legal Izzet colorless Spellslinger lovers are next

Deathtouch makes Rattleback Apothecary a respectable 3-drop with upside

But whosoever finds this dragon has hit the jackpot

However, in limited formats (Sealed Deck, Booster Draft and Rochester Draft to be specific), commons are a lot more relevant than uncommons, which in turn are more relevant than rares