Sepulcher of Lost Knowledge

This card enters the battlefield tapped with 3 Unearth counters. Sacrifice this card when no Unearth counters are attached.
Sacrifice 2 Unearth counters: Search your library for an Artifact with converted mana cost {3} or less and place it into your hand.
Sacrifice 1 Unearth counter: Search your library for a basic land card and place it into
your hand.