Collector Boosterexclusive retro frame cards: Common: Shambling Shell Uncommon: Sphere of Safety, Aetherize, Narcomoeba, Turnabout, Creeping Chill, Darkblast, Shattering Spree, Perilous Forays, Wilderness Reclamation, and Magewright's Stone Rare: Rest in Peace, Gigantoplasm, Pack Rat, Supreme Verdict, Pithing Needle, Karn's Bastion, and Thespian's Stage Mythic rare: Enter the Infinite, Niv-Mizzet Reborn, and Maze's End Pack Rat The default frame Pack Rat is intentionally not included in Ravnica Remastered products
I wont be listing them here because that topic deserves its own time to shine
Patience and experimentation is required
They can be tricky blockers after attackers have been declared, or deadly combat tricks like Gatta and Luzzu
Thats it
It seems obvious when I say it like that, but intended use is really important and can sometimes get overlooked