Virtue of Strength and Prismatic Omen
This is a bug. When I have Virtue of Strength and Prismatic Omen in play, every land should be every basic land type, capable of producing three mana of any one color. Under these circumstances, I tapped a Polluted Delta for black mana but it did not produce three mana, only one. This seems to be a consistent error.
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PowerCreep#27739
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Rezzahan#77802
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Having a basic land type does not make a land a basic land. A basic land is a land with the supertype "basic". Giving basic land types to nonbasic lands does not makes them basic. Virtue of Strength simply did not apply to your still nonbasic lands.