Unholy Lagoon

Unholy Lagoon enters the battlefield tapped
when Unholy Lagoon enters the battlefield, you gain the ability to resurrect the last four creatures from your graveyard
{t}:Add {b} or {u}
Player may sacrifice Unholy Lagoon at the end of turn to gain a Black Lotus
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When we stumbled upon the Unholy Lagoon, There was a Erie Unrest that was felt in our very souls.