STASH

To Stash look at the top five cards of your library, you may exile one of them face down
with a Stashed counter on it. Then put the rest or the cards on the bottom of your library in any order
Cards with Stashed counters on them in exile are considered STASHED. You may look at face
down stashed cards you own in exile at any time. If a Stashed card would leave the exile zone remove the Stashed counter from it.
This is based of of Hideaway + Mairsil.