These cards are kind of just generically good, and may be classed as Game Changers if they were legal

Chiss-Goria Treasures | Commander | Abe Sargent Commander (1) 1 Chiss-Goria, Forge Tyrant Creatures (28) 1 Academy Manufactor 1 Ancient Copper Dragon 1 Atsushi, the Blazing Sky 1 Baeloth Barrityl, Entertainer 1 Blightsteel Colossus 1 Bosh, Iron Golem 1 Burnished Hart 1 Cityscape Leveler 1 Darksteel Colossus 1 Dockside Extortionist 1 Duplicant 1 Ganax, Astral Hunter 1 Goldspan Dragon 1 Hellkite Tyrant 1 Iron Myr 1 Metalwork Colossus 1 Meteor Golem 1 Mycosynth Golem 1 Palladium Myr 1 Platinum Angel 1 Platinum Emperion 1 Professional Face-Breaker 1 Rapacious Dragon 1 Reckless Fireweaver 1 Solemn Simulacrum 1 Steel Hellkite 1 Wild-Magic Sorcerer 1 Xorn Instants (4) 1 Big Score 1 Chaos Warp 1 Unexpected Windfall 1 Valakut Awakening // Valakut Stoneforge Sorceries (4) 1 Inspired Tinkering 1 Pirate's Pillage 1 Seize the Spoils 1 Visions of Ruin Enchantments (2) 1 Curse of Opulence 1 Passionate Archaeologist Artifacts (24) 1 Caged Sun 1 Cursed Mirror 1 Darksteel Forge 1 Dragon's Hoard 1 Elixir of Immortality 1 Everflowing Chalice 1 Expedition Map 1 Fire Diamond 1 Kaldra Compleat 1 Mind Stone 1 Mind's Eye 1 Nettlecyst 1 Nyx Lotus 1 Portal to Phyrexia 1 Sol Ring 1 Staff of Nin 1 Stonespeaker Crystal 1 Swiftfoot Boots 1 Trailblazer's Boots 1 The Reaver Cleaver 1 Thought Vessel 1 Thran Dynamo 1 Whispersilk Cloak 1 Worn Powerstone Lands (37) 20 Mountain 1 Buried Ruin 1 Crawling Barrens 1 Darksteel Citadel 1 Demolition Field 1 Great Furnace 1 Hall of Tagsin 1 Inventors' Fair 1 Karn's Bastion 1 Mirrex 1 Myriad Landscape 1 Nykthos, Shrine to Nyx 1 Power Depot 1 Rogue's Passage 1 The Mycosynth Gardens 1 Treasure Vault 1 Urza's Saga 1 Valakut, the Molten Pinnacle And there we go

If you've got any suggestions for this list, use the comments section below
Note that this prevents damage to you, but not to your stuff, so you cannot trade
When a monster(s) is destroyed by this card's effect: You can target face-up monsters your opponent controls equal to the number destroyed
Legendary Creature - Rogue Time Lord The Master, Mesmerist : Target creature an opponent controls with power less than or equal to The Master's power gains skulk until end of turn