Land
Sacrifice a creature with recover, T: add R to your mana pool for each poison counter you have
At the beginning of your upkeep, ~this~ gains ''Whenever one or more artifacts leaves the battlefield, you may Sacrifice a creature with toughness 6 or less. If you don't, you lose 1 life for each instant spell cast this turn'' until end of turn
B, T: put a depletion counter on ~this~
Discard a card, remove a depletion counter from ~this~: draw two cards, then discard two cards

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AlexChurchill/TypeFourLandGenerator