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It means they cant be countered - and if you also find a way to flicker your enchantments to ensure they can enter the battlefield without being cast at all, you suddenly have a way to put nearly everything in your deck into play with ease
Appendage Amalgam Barrier of Bones Basilica Stalker Blood Operative Clandestine Meddler Dawnhand Dissident Desmond Miles Dogged Detective Doom Whisperer Faerie Dreamthief Fandaniel, Telophoroi Ascian Grave Researcher Grim Javelineer Heirloom Auntie Joo Dee, One of Many Kroble, Envoy of the Bog MACH-1, Swooping Scoundrel Namazu Trader Nightblade Brigade Purple Pentapus Sanguine Spy Seer of Stolen Sight Sinister Starfish Snarling Gorehound Spider-Man Noir Starlit Soothsayer Starving Revenant Twilight Diviner Umbral Collar Zealot Unshakable Tail Whispering Snitch Wreckage Wickerfolk Wretched Doll
The idea is that Skullclamp is purposely put on 1/1 creatures, which are killed by the -1 to Toughness, giving the owner two free cards
Other cards will also interact with the Location mechanic in novel ways yet to be revealed
Unlike the old days, alternative win conditions are a real possibility in Magic