Nana Bec, Moonfin Weaver

Other Merfolk get +1/+1 and have islandwalk.
Whenever a Merfolk you control becomes
tapped, create a 1/1 blue Merfolk creature token
with Hexproof.
Whenever a Merfolk you control becomes
untapped, draw a card.
{g/w}{w/u},{t}: tap or untap another target
Merfolk creature.