Some players may try to Cascade into Crashing Footfalls and the like, but even casting a basic Tarmogoyf or Lightning Bolt is well worth the mana
Great gift for collectors
Of course, Id argue there are even two tiers below it if more grading companies are included: E for less popular but still reasonable grading companies, like GRAAD (Italian), Platin (German), CGA/ARK (Australian), EG (Spanish), etc
Since play boosters will match the cost of a set booster, which is roughly $1 USD more than a draft booster, Limited events will probably adjust their pricing to reflect that
MDFC lands get their power from flexibility, that's why
Overall, I have to say that Im pretty disappointed in this iteration of Athreos