The blight counters on Ultima, Origin of Oblivion may not be functioning properly.
I put a blight counters on it with Ultima, Origin of Oblivion that I control, and my opponent's Sacred Foundry produced red mana.
My opponent had Marina Vendrell as their commander, no other red mana sources, and was playing a red mana card.
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Sola_Mikage#21660
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Rezzahan#77802
commented
Buried in the Garden does not just exile a creature, it also has the text:
"Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color."
This ability doesn't care about the land only being able to produce colorless mana. The enchantment is what is creating the additional mana, which can be red.