Polnareff, Beholder of Requiem

Partners with Silver Chariot, Weakened
Stand master of Silver Chariot, Weakened (You
may attach Silver Chariot, Weakened to this creature
from your hand without paying its mana cost.)
When Polnareff, Beholder of Requiem enters the battlefield, search your library for a card named Requiem Arrow and attach it to Polnareff,
Beholder of Requiem, then shuffle your library.