Sacrifice after III.) I Each player mills four cards
There are a few choice stickers to use to profit mana: Guacamole, Misunderstood, Narrow-Minded, Baloney, Unsanctioned, Phyrexian, Minotaur, Delusionary, Gelatinous, and Dinosaur
Gate-based ramp spells like Explore the Underdark and Circuitous Route are astonishingly efficient mana fixers that can fix for four colors at once
These cards are not powerful enough to be deck-defining cards in playable decks nor are they bad enough that you would never consider them
Not only is the exact placing very subjective but there are a vast number of cards that seem rather hard done by to not be on this list including Sylvan Library, Joraga Treespeaker, Birthing Pod, Rofellos, Natural Order, Wall of Roots, Lotus Cobra and many more