Horizon Lake enters the battlefield tapped.
: Add to your mana pool. Return Horizon Lake to its owner's hand.
: Horizon Lake becomes a 2/2 blue Merfolk creature until end of turn. It's still a land.
: Add 
to your mana pool. Return Horizon Lake to its owner's hand.
: Horizon Lake becomes a 2/2 blue Merfolk creature until end of turn. It's still a land.
