Most notably, after you get four cards in the Lost Zone, you can attack for free with Cramorant [Lost Origin], seven allows you to accelerate Energy with Mirage Gate [Lost Origin], and ten cards allows you to spread damage counters with Sableye [Lost Origin]
A 2/5 for 4 mana is already a great value, but combine that with flying, toxic, vigilance, and corrupted, and you have a war crime
If you have Meloku on board, you can cast Time Warp, then play Mystic Sanctuary to put Time Warp on top of your library, and activate Melokus ability to bounce Mystic Sanctuary to your hand and make a 1/1 Illusion
Our good friend Justin Gennari posted some sweet videos in this last week
But why is this the case
The rest are all Dispossess or Lost Legacy with a card type restriction