Lots of stuff would die to your Fire Imp that they had cast on turns 1 or 2, so you could stamp out stuff like Soul Warden, Birds of Paradise, Priest of Titania, and more
5 Obeka, Splitter of Seconds Operates on a Whole New Axis Untap, Upkeep, Upkeep, Upkeep, Draw Obeka has distinguished herself as an Ogre of unique design sensibilities, with her previous iteration possessing the unique ability to end the current turn with her activated ability, circumventing potentially lethal "end step" triggers
You can also have cards like Indominus Rex, Alpha, which has lifelink if you discard a lifelink creature
All your permanents get a lot harder to deal with
These tests are: - The "Green Dot" Test - The Rosette Test - The Over-Print Test - The Light Test The first three tests can be done easily with a 30x or 60x loupe, however most new camera phones can zoom in enough to use for the rosette test, and the over-print test (but not the green dot test)