Caveborn Siphon
Gargantuan Leech is a straightforward threat for late game black shells. The card lets you convert board and graveyard cave density into tempo since the spell costs {1} less for each Cave you control and each Cave card in your graveyard. With lifelink and a 5/5 body, the Leech closes races and stabilizes life totals while you build the cave engine that pays the casting price down.
In practice the Leech wants targets that populate Cave cards or make Caves enter play. It pairs well with cheap sacrifice outlets and tutors that refill the graveyard. The card reads plainly so deck building is the work; slot it in when your list needs a resilient finisher that also rewards exploration of the Lost Caverns of Ixalan theme.
Card Details:
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Mana Cost {7}{B}
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Card Type Creature
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Subtypes Leech
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Card Text / Rules Text (Printed) This spell costs {1} less to cast for each Cave you control and each Cave card in your graveyard. Lifelink.
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Power / Toughness 5/5