With KCI, a one mana artifact can be sacrificed for two mana, so whatever it is, you can play it and sacrifice it and now youre mana neutral on your loop
From a design standpoint, banding is very flavorful
(Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays 3 life.) Magecraft Whenever you cast or copy an instant or sorcery spell, create a 1/1 black and green Pest creature token with "When this token dies, you gain 1 life." Creature - Human Warlock Tokens (CTRL to add secondary) Tutor Beseech the Mirror Bargain (You may sacrifice an artifact, enchantment, or token as you cast this spell.) Search your library for a card, exile it face down, then shuffle
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Being able to protect other creatures gives this card the Giver of Runes/Mother of Runes feel
If left on the battlefield for several turns these days, it can still be quite strongespecially since creatures are routinely better than they once were