Dreadhorde Valkyrie

Riot, flying, mentor, battle cry
Raid - At the beginning of your end step,
if you attacked with a creature this turn and
Dreadhorde Valkyrie is in your graveyard,
you may return Dreadhorde Valkyrie to the
battlefield under your control.
If you do, amass 1.
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"Eternalia is the fist of the second sun, my eternal
flame." - Nicol Bolas, Dragon God Pharaoh