It's a solid inclusion in Dinosaur Tribal decks like Gishath, Sun's Avatar, it's an undercosted 7/7 so it's great in Ghalta, Primal Hunger, and it has a whopping 12 mana cost so it's great in CMC Matters decks that run stuff like Nissa's Revelation
There are plenty of good options for this in Modern, but free counters like Force of Negation work best
Glorfindel, Dauntless Rescuer Glorfindel, Dauntless Rescuers ability can give you some solid control over how your opponents block, which can serve as a form of removal if youre able to buff Glorfindel
Transforming Gwen Stacy doesn't cause her to leave the battlefield, which means that the card you exiled when she entered can still be played after she transforms
Seal the Sleeve (or Top Loader) Seal your sleeve or top loader with tape, putting a slip of paper on top of the sleeve / top loader to prevent the tape from touching the cards
Each turn you will be racking your brain trying to figure out the best way to sequence your play so that you can build the best position possible
