Nerlon, Undersea Oppresser

Eminence- As long as Nerlon, Undersea Oppresser is in the command zone or on the battlefield, other Merfolk spells you cast cost {1} less to cast.
{1}{w}{u}{g}: Merfolk you control get +1/+1, gain lifelink, and gain islandwalk until end of turn. Activate this ability only once per turn.
{2}{u}: Target land becomes an Island
until end of turn.