A strange human comes to the land of Equestria with an intriguing offer - Come fight in the greatest combat showcase of all time: the Alternian Multiverse Tournament! Fighters from across the multiverse will come together to display their skills for all to see! Surprisingly, at least to the princesses, everyone the guard has asked has said yes! How will the ponies fare in the showcase of warriors? Will friendship spread to even the cruelest fighters? The answer lies in the heart of battle...

(Crossover with everything I like and then some, with the ponies as the POV characters.)