Mainly they revolve around the elemental crystals with artifact cards for the darkness, earth, fire, water and wind crystals, all of which are now quite rightly legendary artifacts
You play the card while Clive's Hideaway's last ability is resolving and still on the stack
His +1 will Loot a card, and then his -3 will phase out an opposing dork about to kill him, and then you can -10 him to Time Stretch and likely win
Plus, a lot of cards on the Modern banned list essentially can't be unbanned because they would assuredly ruin the format
Notice that since they are both uncommons, this pair works as a Pauper commander
These borderless cards appear in both Play Boosters and Collector Boosters