Forum:Xyz Vs. Macro Cosmos

So, on DN I was facing someone in unrated, and they had a Macro Cosmos out, the they summoned Leviair the Sea Dragon, and detached to bring back a monster that was Banished. Now my question is can they do that, since you have to detach to the graveyard, but the Materials are being banished so... what happens? --99.64.68.87 (talk) 19:46, August 17, 2011 (UTC)