Draszna, Forest's Shadow

If you have gained life this turn, Draszna,
Forest's Shadow is unblockable.
When Draszna deals combat damage to a player,
reveal the top card of your library. If it's a land
card, put it onto the battlefield tapped.
Otherwise you may put it into your hand, or
into your graveyard. If you put it into your
graveyard, you gain life equal to its mana value.