Storm-Bringer Valkyrie

Flash, flying
Berserk {1}{r} (When this creature attacks, you may pay its berserk cost to double its power. If you do, sacrifice it at end of turn.)
Reincarnation 4 (When this creature dies, you may return target creature card with converted mana cost five or less from your graveyard to your hand.)
It takes but one valkyrie to lead the host.