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It triggers other enchantress effects when it enters, it's harder to remove than a creature, and it survives board wipes that would take out your Argothian Enchantress or Mesa Enchantress

They are ramping a little, thinning your deck, giving you some board presence which might be useful for Overrun effects or mana production effects

What makes one card less valuable also makes it more valuable in many situations

Blade of Selves grants Myriad, which means you get extra attacking tokens of the equipped creature, each one entering as a copy

The power of the artifact lands isn't so much the lands themselves but some of the artifact payoffs that are already popular in the Modern format

Casting Cost: Card Type: Legendary Creature - Human Knight // Legendary Creature - Demon Power / Toughness: 3 / 5 / 2 / 5 Card Text: Whenever you cast a noncreature spell, surveil 1