Artifact
At the beginning of your precombat main phase, target land gains ''spells and activated abilities that aren't mana abilities cost all players an additional ''Pay 3 life'' to cast'' (This effect doesn't end) and tap that permanent and all creatures with both power and toughness 2 or more get -2/+2 until end of turn and those creatures gain banding until end of turn and ~this~ deals 1 damage divided as you choose among any number of target players
Pay 3 life, Sacrifice ~this~: two target creatures with power 1 or more get -2/+1 until end of turn

Converted mana cost: 1

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AlexChurchill/TypeFourArtifactGenerator