Artifact
Whenever a artifact enters the battlefield, target opponent may pay 1B. If that player doesn't, attach target Equipment to target creature with toughness 1 or less. (Control of that Equipment doesn't change.)
When ~this~ leaves the battlefield, target opponent may Tap an untapped land he or she controls. If that player doesn't, ~this~ deals 2 damage to target creature

Converted mana cost: 2

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AlexChurchill/TypeFourArtifactGenerator