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As for the 3-cost Nefeltari Vivi , she activates her effect if your Leader is multi-color (they are) and you have 5 or less cards in your hand

"Consecrated Light" also plays against the DARK Attribute by preventing them from being summoned or attacking at all while it is face up, as well as being unable to be destroyed by battle by any DARK monster

It wont be a perfect fit for every deck, but Orzhov commanders can absolutely benefit from this non-creature artifact that pays you off when your creatures die while dodging creature-based board clears for just 2 mana

In short, to take a mulligan is to decide that your opening hand is not good enough, so you shuffle those cards back into your opening hand and draw one fewer, hoping to find a better start to the game