Graves have opened

All permanents in all graveyards return to the battlefield under your control. All the creatures returned gain haste until the end of the turn.
You gain 1 life for each permanent returned this way.
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"The dead-ones came back and the first thing they have done was attack the Dimir. I can't understand them, couldn't they attack the Orzhov? Or the Golgari?
-Etrata, the Silencer.