You may ask "So? why not just use unsummon?". Well the reason that I don't is because it is re-usable, (it returns to your hand along with the enchanted creature after your upkeep) and it only costs 1 mana. That means 2 things; 1) you can continuously get your opponents creatures out of the way for cheap. And 2 ) if you have a creature that has an awesome ability that can only be used when it enters the battlefield, (Izzet Chronarch for example) you can enchant it to return it to your hand, then recast the creature so you can activate its ability again, then enchant it again with the same aura to repeat the process however many times you want. I was planning on recreating one of my decks into the game but it revolves around this card.
I was thinking that I might know the solution, but I can't seem to get it to work. I don't know if that's because I'm terrible at coding or if it's just impossible. My idea was to sort of combine some of the code from Grifter's Blade (which is an equipment that acts like an aura, in the sense that it enters the battlefield attached to a creature.) and unsummon to make an equipment version of Mark of Eviction. (just because I didn't see any way to use the script of unsummon to make an aura return to your hand.)
Any ideas on how to make this work?