As Merfolk are a creature type known for their numerous lords, these tokens can easily function as notably larger creatures, even having access to evasion when paired with the likes of a Lord of Atlantis
Lord Skitter, Sewer King produces a new 1/1 Rat at the beginning of combat on each of your turns
In an end-game situation, this will let you refuel your hand if you get unlucky draws and give you a 3/2 creature on the battlefield
I wouldnt really count on frequently getting that 4/3 token, but it isnt impossible, and gaining 2 life every time you sacrifice something will be very doable, especially with map tokens in the format
The card gives you a strong mix of card selection and card advantage, because getting two cards from four options is often stronger than drawing three cards and at instant speed no less
Bring to Light Scapeshift is the last type of deck the Elementals will struggle against