Artifact
All artifacts gain ''When ~this~ is put into a graveyard from the battlefield, each player loses 1 life for each basic land type among lands you control''
Whenever an opponent is dealt damage, ~this~ gains ''All nonbasic lands are Mountain lands in addition to their other types'' (This effect doesn't end)

Converted mana cost: 3

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AlexChurchill/TypeFourArtifactGenerator