Romika, Lost Mage

When Romika, Lost Mage enters the battlefield
create two 1/1 merfolk and a 2/2 black human.
At the beginning of your upkeep, you may
sacrifice a creature. If you do put a +1/+1
counter on each creature of the chosen type:
• Humans
• Merfolk
During your endstep, if you picked humans, you
gain 4 life. If you picked Merfolk, you may search
your library for a basic land and put it
onto the battlefield tapped.