The Operator

Bestow {w}{u}{b}{r}{g}

When The Operator enters the battlefield as a creature, search your library for a Warframe card with mana value
X or less, reveal it, put it into your hand, then shuffle your library.

Void Sling — {t}: Return The Operator to its owners hand. Activate only as a sorcery.

Enchanted creature gets +4/+4 and has indestructible.