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You were making a four-mana Abyssal Specter that couldn't be Dark Rituall'ed on turn one rather than removing the issue of the Ritual

This means that they have a very linear and steady progression in game (which is different from a linear strategy which all three of these archetypes have!)

But Magic rarely offers that clean choice

Also, as head designer Mark Rosewater once noted, the Ravnica: City of Guilds set was the first to make in-game factions highly cohesive and distinct thanks to their official names, watermarks on cards, and many cycles

Unmarked Grave nicely fills a middle ground that is more flexible than Buried Alive, but more fair than Entomb in terms of restrictions, mana cost, and casting speed while still being efficient