Eerd, Wayward Channeler

Ninjutsu {u}{g} ({u}{g}, Return an unblocked
attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
When Eerd, Wayward Channeler enters the
battlefield from your hand, if it's attacking, you
may pay {2}. If you do, search your library for a
basic land card, put that card onto the battlefield
tapped, then shuffle.