Artifact
Sacrifice ~this~: put a 1/1 Myr artifact creature token onto the battlefield
Sacrifice seven Myr: target white creature gets +2/+2 until end of turn
1W, sacrifice a Myr: target untapped enchantment can't be the target of activated abilities until end of turn

Converted mana cost: 4

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AlexChurchill/TypeFourArtifactGenerator