Lantern Delver

Whenever Lantern Delver explores, you may
reveal the bottom card of your library instead of
the top card.
Whenever Lantern Delver attacks, you may
sacrifice an artifact or pay 3 life. If you do,
Lantern Delver explores. (Reveal the top card of
your library. Put that card into your hand if it's a
land. Otherwise, put a +1/+1 counter on this
creature, then put the card back or put it into
your graveyard.)