Between this and the fact that blacks best mana ramp spells only tend to thrive in specific niches of the Commander format, such as cEDH, mono and two color black decks, combo decks, and/or builds with reliable access to Urborg, Tomb of Yawgmoth, theres really no way to rank these cards
This card is primarily the reason why youre so restricted on what non-blue cards you can play (Force of Will being a distant secondary reason), so your hands are a little tied in the deckbuilding process, but again, your options are pretty low here
+1/+1 counter archetypes are extremely popular in these colors, and both Wave Goodbye and Tributary Instructor should be immediate inclusions for the majority of those decks
Creatures (29) 4 Robber of the Rich 4 Bonecrusher Giant 4 Torbran, Thane of Red Fell 4 Rimrock Knight 4 Anax, Hardened in the Forge 2 Phoenix of Ash 3 Magda, Brazen Outlaw 4 Goldspan Dragon Lands (22) Spells (9) One last note on Magda: in more powerful formats, like Historic, remember that Toolcraft Exemplar is a Dwarf Second on our list could easily be number one if all you care about is likelihood of getting banned, since this one is most certainly getting banned and soon
Parallax Tide, Parallax Wave, and Opalescence allow us to generate infinite landfalls (remove lands with tide, remove tide with wave, remove wave with wave, recycle - this also generates infinite mana since you can tap the lands as they enter)
Sometimes we've had great applications of it, like in Modern Horizons 2 and Commander Legends, and other times it's been hard to notice, like in Strixhaven's Mystical Archive