(: Add or to your mana pool.)
Whenever Watery Plains becomes tapped, it deals 1 damage to you.
: Watery Plains becomes a 2/1 blue and white Illusion Merfolk creature until end of turn. It's still a land.
: Add 
or 
to your mana pool.): Watery Plains becomes a 2/1 blue and white Illusion Merfolk creature until end of turn. It's still a land.
