Artifact
Discard a card: put a leak counter on target enchantment
T: tap target land with a leak counter on it
Imprint — When ~this~ enters the battlefield, you may exile a creature card in your hand. (The exiled card is imprinted on this artifact.)
B: target player gains the imprinted card's converted mana cost life
All colourless creatures gain ''4UB: put a 1/1 Myr artifact creature token onto the battlefield'' and ''Discard a card, sacrifice any number of Myr: that many creatures gain protection from lands until end of turn'' and ''Sacrifice ~this~, Sacrifice a blue creature, sacrifice a Myr: target blue creature gets -2/+2 until end of turn''

Converted mana cost: 2

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AlexChurchill/TypeFourArtifactGenerator