Combjaw Leviathan

When Combjaw Leviathan attacks, you
may pay {b}. If you do, destroy target creature with power or toughness 1 or less. Activate this ability only once per combat.
{2}{u}: target creature gets -1/-0 until end of
turn. Spend at least {u} from Islands to
activate this ability.

Anything small enough is funneled into its maw.