When Graven Lake enters the battlefield, sacrifice it unless you pay 2 life.
: Add to your mana pool. Activate this ability only if you control a Mountain.
: Add to your mana pool. Activate this ability only if you control an Island.
: Graven Lake becomes a 2/2 red Dwarf creature until end of turn. It's still a land.
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: Add 
to your mana pool. Activate this ability only if you control a Mountain.
to your mana pool. Activate this ability only if you control an Island.
: Graven Lake becomes a 2/2 red Dwarf creature until end of turn. It's still a land.
