Artifact
At the beginning of your combat phase, put a leak counter on ~this~. If ~this~ has X or more leak counters on it, where X is the number of poison counters you have, flip it.
1: draw a card
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Legendary Artifact
Equip X, where X is the number of basic land types among lands an opponent controls
Sacrifice a colourless creature: you gain 1 life for each card in your hand
Equipped creature gains protection from black creatures

Converted mana cost: 7

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AlexChurchill/TypeFourArtifactGenerator