Because you get it back when you trash it, Procession basically KCs a Fortress, which turns it into a Superlab that also gets you a free 5-cost action. Awesome. If you Procession a Procession you can use it on the same Fortress twice, playing it a total of 5 times and gaining 3 5-cost actions (though you do lose a Procession). Throw in Band of Misfits (an excellent 5-cost card for you to gain with these shenanigans) and you can make this combo last even longer - Procession a BoM (as Fortress), then turn around and use the BoM again as a Procession to double play that other Fortress you just drew.
Basically these two 4-cost cards can make for a juggernaut drawing/gaining engine with is pretty sweet especially with good spammable 5-costers like Festival and Bazaar. They don't even have to spammable because all this Fortressing is getting you crazy +Actions. Works pretty well to get lots of Cultists in a hurry too.
I'm really glad I tried this first against a bot on Goko. If I'd tried this combo against a person, they might have rage-quit because my turns ended up being absurdly long.
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Topic: Procession + Fortress is really fun (Read 2930 times)