De'isveinn, Leyline Unbound

When De'isveinn, Leyline Unbound is transformed, choose one:
• search your library for a basic land card and put in onto the battlefield tapped
• add either {g}{u}, {u}{r}, or {g}{r} to your mana pool
When you cast your second instant or sorcery each turn, transform De'isveinn, Leyline Unbound.