Tokens, reference cards and storage box
Reliquary Tower A staple contender, but I think it only locks slots in blue and black decks or other decks that dedicate a lot of time to building their hand
Inspect the back swirl gradient and color, a frequent giveaway on counterfeits
Alibou, Ancient Witness Alibou, Ancient Witness Anger Arlinn, Embraced by the Moon Barbarian Class Blur Sliver Cyclops of Eternal Fury Dragonlord Kolaghan Emblem of the Warmind Fervor Fires of Yavimaya Firion, Wild Rose Warrior Garna, the Bloodflame Gimli's Reckless Might Goblin Warchief Hammer of Purphoros Hellraiser Goblin Invigorating Hot Spring Karrthus, Tyrant of Jund Keldon Strike Team Kragma Warcaller Madrush Cyclops Maelstrom Wanderer Maze Rusher Oni of Wild Places Avatar Purphoros, Bronze-Blooded Rising of the Day Samut, Tyrant Smasher Samut, Voice of Dissent Smellerbee, Rebel Fighter Tahngarth Tannuk, Steadfast Second Temur Ascendancy The Fire Crystal Thopter Engineer Tuktuk Rubblefort Urabrask the Hidden Yarus, Roar of the Old Gods
Artifact - Bobblehead Artifact (CTRL to add secondary) Counters Winding Constrictor If one or more counters would be put on an artifact or creature you control, that many plus one of each of those kinds of counters are put on that permanent instead