Why I mention this card is because of its callback to Gilder Bairn, a card that holds a lot of nostalgia for me: many years ago I built a Superfriends deck for my then-boyfriend, and I picked up a foil Gilder Bairn for the deck
Tournament play was rapidly increasing in popularity and inconsistent rulings across events was becoming a big problem
Cold-Eyed Selkie, 1 G/B G/B, provides the ability to quickly get a number of new hand cards whenever she deals combat damage to an opposing player
The possibility that a Heliod player could suddenly rip a lethal combo off the top of their deck at instant speed makes every decision difficult for the opponent and lets you overload enemy interaction in a flurry of creature cards
Not only is this card the second-most valuable from Weatherlight, it's in the top five across the entire Mirage block, behind only the big guns: Lion's Eye Diamond, Phyrexian Dreadnought, Vampiric Tutor, Shallow Grave and 1