Jet Collector

Creature — Merfolk Scout — {1}{G}

At the beginning of your second main phase, if four or more cards are in your graveyard, conjure a card named Mox Jet into your hand. This ability triggers only once. {X}{B}: Put target creature card with mana value X from your graveyard onto the battlefield with a finality counter on it. Activate only as a sorcery.