Vodalian Mer-Lion

Islandwalk (This creature is unblockable as long as defending player controls an Island.)
{3} Add {u/b}{u/b} to mana pool.
{5}{u/b}{u}{b} Sacrifice Vodalian Mer-Lion and
gain 3 life.
Vicious nocturnal creatures they are. Attacking
when you least expect it.