13.3 If the Seller sells a Lot that was unsold at the Sale: (a) within 90 days after the Sale to a person who was registered to bid at the Sale
this Leafeon ex is no delicate leaf
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
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)
+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
This is actually surprisingly easy if you employ a few type-changing tricks again