Druid of Passing

Whenever Druid of Passing enters the battlefield, search your library for two land cards and put them into your graveyard.
You may cast lands from your graveyard.
Threshold - If you have 7 or more cards in your graveyard, Druid of Passing gets persist and 'Whenever you cast a land, Druid of Passing gains +1/+0 and deathtouch until end of turn.'