Its a perfect example of early Magic design what we would later label a top-down approach which tries to match the lore as literally and intuitively as possible, even if it makes cards harder to understand at first glance
Black Market: Like Pitiless Plunderer, Black Market tracks creature deaths and gives you mana, but instead of a one time payout, this enchantment gives you mana each round
Like most Magic: The Gathering cards, the value of Eerie Ultimatum depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (The List)
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2 Gonti's Aether Heart Gonti, With The Extra Turn Assist "Take an extra turn" are dreaded words to see on a Magic card
However, opponents casting more than one spell per turn happens fairly often, which means you'll likely draw some cards out of Mangara's second trigger