Mark of Light OR Mark of Time, whichever you prefer.
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This deck was made to quickly and effectively defeat AI3 for farming. It won't get you mastery, but as many have said, speed > mastery. You can kill quicker, which gets you more spins, which potentially gives you more money. If you don't want to play it upgraded, then replace the Ray of Lights with Light Pillars. The Morning Star/Glory is optional, and can be replaced with Eternity, or just a normal weapon.
The point of the deck is to blessing your Deja Vus before copying them. Only one Blessing is required on a single Deja Vu, so if you have two in play that can still split, and two Blessings in your hand, use one Blessing on each one, then split. ALWAYS wait until the turn after you play a Deja Vu to Blessing it, since it can't split the same turn it comes into play, and is quite vulnerable. It works perfectly well with the number of pillars it has, since you really only need one Time Pillar in play for the deck to work. The weapon adds extra damage, which speads up the kill. This deck gets past Bone Shields very well, too, but is weak to Rain of Fire and Procrastination and Fire Shield, but you don't see those too often in AI3 matches.
Enjoy! =D