Blackcleave Pools enters the battlefield tapped.
: Add or to your mana pool.
Put Blackcleave Pools on top of your library: Add to your mana pool.
: Blackcleave Pools becomes a 2/2 blue Crab creature until end of turn. It's still a land.
: Add 
or 
to your mana pool.
to your mana pool. : Blackcleave Pools becomes a 2/2 blue Crab creature until end of turn. It's still a land.
