Artifact
2: target land is a creature with power and toughness equal to its converted mana cost in addition to its other types (This effect doesn't end)
At the beginning of each opponent's combat phase, you may pay 3. If you don't, ~this~ deals 1 damage to target creature or player. If a creature damaged this way would be put into a graveyard this turn, exile it instead

Converted mana cost: 1

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AlexChurchill/TypeFourArtifactGenerator