Artifact
When ~this~ enters the battlefield, attach target Equipment to target creature with both power and toughness 3 or more. Gain control of that Equipment (This effect doesn't end) and up to six target untapped blocking creatures get -1/+1 until end of turn and those creatures are creatures with power and toughness equal to their converted mana cost in addition to their other types until end of turn
When ~this~ enters the battlefield, any number of target untapped artifact creatures get +3/+3 until end of turn and those creatures gain protection from instant or sorcery spells until end of turn
All tapped red creatures get +3/+3

Converted mana cost: 4

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AlexChurchill/TypeFourArtifactGenerator