I like this in mill brews where you can add to the foe's milling by exiling their cards with your combat just naturally over time, and they don't go to the graveyard for later use or recursion or flashing back
I think the integration was done really well and made for a fun and interesting set
Beanith: If it wasn't for the fact I'm still waiting for the second wave of 40k Commander decks to hit Australia, I would be all over the Urza's Iron Alliance precon Deck and scoping out which of these stompy robot lads I wanted to add to my deck of terrible ideas (I did terrible terrible things to the Dungeons of Death precon)
Practically any effect that creates a token copy of something can be manipulated with this effect, including cards like Flameshadow Conjuring and Delina, Wild Mage
With Viridian Shaman type creatures you have to hold them back based on the game state to get any real value from them and with cards like Qasali Pridemage which can be more proactive you have to lose the dork in order to use it as removal
More Information Should I remove cards from sleeves and binders
