R2-D2, Repair Droid

When R2-D2, Repair Droid enters the battlefield, you may search your graveyard for an artifact and return it to the battlefield tapped.

{1}{w},{t}: Tap target creature.

When a creature you control deals combat damage
to a player, search your library for an artifact, put it
in your hand, then shuffle. This ability triggers only once per turn.