Sacrificial Myr

When Sacrificial Myr leaves the battlefield, you
may return an artifact with converted mana cost
two or less from your graveyard to the battlefield.
Evoke {4}{p/b}(You may cast this spell for its evoke cost.
If you do, it's sacrificed when it enters the battlefield.)
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"At the end of the conflict, myrs rose out of the smokestacks, the horrors."