Scar-Laid Littoral

When Scar-Laid Littoral enters the battlefield, sacrifice a swamp and an island unless you pay 4 life. Scar-Laid Littoral doesn't untap during your untap step.
{2}, Pay 2 life: Untap Scar-Laid Littoral
{t} Add {u}{u}{b}{b} to your mana pool