There is a lot of value in cards that can reanimate a bunch of Creatures in one fell swoop, with cards like Funeral Room or Rise of the Dark Realms
FAQ Can I use this [Activate: Main] effect to give a Character a DON
At the very least youre removing the chance for your opponent to use the card
The RFID blocking card holder is small enough that it will fit into the card section of your purse/wallet

I made the mistake of trading him an Ephara and he ended up putting together this deck: [deck title= Epharas Flash Mob] [Creatures] *1 Snapcaster Mage *1 Deputy of Acquittals *1 Whitemane Lion *1 Suture Priest *1 Spellstutter Sprite *1 Silverchase Fox *1 Vedalken Plotter *1 Pestermite *1 Aven Mindcensor *1 Stonecloaker *1 Dewdrop Spy *1 Deceiver Exarch *1 Ethersworn Shieldmage *1 Venser, Shaper Savant *1 Phyrexian Metamorph *1 Dust Elemental *1 Thistledown Liege *1 Restoration Angel *1 Glen Elendra Archmage *1 Kor Cartographer *1 Hollowhenge Spirit *1 Voidmage Husher *1 Ephara, God of the Polis *1 Sturmgeist *1 Teferi, Mage of Zhalfir *1 Darksteel Sentinel *1 Deadeye Navigator *1 Draining Whelk *1 Angel of Serenity *1 Phyrexian Ingester *1 Diluvian Primordial *1 Luminate Primordial *1 Trench Gorger [/Creatures] [Spells] *1 Saving Grasp *1 Wayfarers Bauble *1 Enlightened Tutor *1 Flickering Ward *1 Sol Ring *1 Swords to Plowshares *1 Scouts Warning *1 Mystical Tutor *1 Hoofprints of the Stag *1 Confound *1 Talisman of Progress *1 Remand *1 Azorius Signet *1 Into the Roil *1 Fellwar Stone *1 Forbid *1 Hinder *1 Cackling Counterpart *1 Repulse *1 Sphinxs Revelation *1 Dream Fracture *1 Capsize *1 Detention Sphere *1 Return to Dust *1 Cloud Cover *1 Dismiss *1 Evacuation *1 Desertion *1 Austere Command [/Spells] [Lands] *1 Academy Ruins *1 Adarkar Wastes *1 Azorius Chancery *1 Command Tower *1 Calciform Pools *1 Celestial Colonnade *1 Eiganjo Castle *1 Glacial Fortress *1 Hallowed Fountain *1 Halimar Depths *1 Homeward Path *1 Kor Haven *1 Maze of Ith *1 Minamo, School at Waters Edge *1 Mystic Gate *1 Reliquary Tower *1 Skycloud Expanse *1 Springjack Pasture *1 Strip Mine *1 Temple of Enlightenment *1 Temple of the False-God *1 Vesuva *5 Plains *11 Islands [/Lands] [/Deck] Swag focuses on playing a control game with this deck and uses a whole host of flash creatures to repeatedly trigger Epharas ability to draw cards

In that format, it can be oppressive because its naturally cheap and can stop blockers from doing their work, or it can just get ahead on value when paired with strong ETB effects