So I got to thinking about how Quicksilver Mirror is a powerful card and how much I'd love to have it see play so I came up with this deck that has been getting me win after win in Masters and can hit its combo fairly regularly.
The basic combo is to play Quicksilver Mirror and then play Svetya. Yes, Svetya is great early if you are already beating them up - this is a midrange deck mainly - but if you can hold back on Svetya until you can play Mirror first, you can shut out games, something which I've done several times already. You have a lot of Aegis units, so another good time to play Svetya is just after a sweeper takes off your aegii. Here's why some of the other cards that may need explanation:
Messenger Hawk - Great to have more Svetyas in your deck allowing you to gum up the enemy's plays even more. My priority when copying is usually - Svetya > Merchant > Enforcer > FeastCaller > Everything else
Borderlands Waykeeper - A gatekeeper aegis unit, the unit I swap away later on. Wanted both defenses (3 health and aegis) to help with aggro decks
Vanquish - Vara hate mainly, but works with any big units ;)
Vanquisher's blade - Double Vara hate. As other have said, don't always save it for the spellcraft - it's also a fine 2/2 for 2 weapon
2 Mirror Image - Works for earlier shutdown with Svetya, or more silence/big aegis units. Not as important as the later Quicksilver Mirror.
2 Avigraft - For the Varas. Also good on merchants and grenadins, other than that, not as useful.
Shelterwing Rider - Pretty bad when Vara is around, which is part of why all the hate. Otherwise, a body that is hard to kill and often left around long enough for it to be copied a ton by Quicksilver Mirror.
Everything else is pretty self explanatory.