Krosan Grave enters the battlefield tapped.
, Pay 1 life: Add or to your mana pool.
, , Sacrifice Krosan Grave: Draw a card.
: Krosan Grave becomes a 2/1 green and black Treefolk creature until end of turn. It's still a land.
, Pay 1 life: Add 
or 
to your mana pool.
, , Sacrifice Krosan Grave: Draw a card.: Krosan Grave becomes a 2/1 green and black Treefolk creature until end of turn. It's still a land.
