Roaming Naga

If there is at least one Swamp on the field, you can Summon the Roaming Naga by sending one Card from your hand to the Grave.
When the Roaming Naga enters the Battlefield, you can place one Swamp from your Hand or Library on the field.
When the Roaming Naga is sent to the Grave, you can add one Roamer from your Library to your Hand.