Artifact
Tap an untapped Myr you control: ~this~ deals 6 damage to each player
When ~this~ is put into a graveyard from the battlefield, you may Tap an untapped permanent you control. If you do, put a leak counter on target land
1: target permanent with a leak counter on it is a artifact in addition to its other types (This effect doesn't end)

Converted mana cost: 7

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AlexChurchill/TypeFourArtifactGenerator