First, some notes on Wayne Reynolds's art style. Whether or not you know his name, you will recognize his art style. His hard, crisp lines give his work a very distinct feel and look and it usually looks really nice and unique.
Best Art: Ink-Eyes, Servant of Oni
Sexy, rat, ninja. Seriously, who would have thought those words could co-exist in the same sentence? But, Wayne Reynolds did it and it is glorious. I love this art and it is probably one of my favourite pieces of art from Kamigawa block entirely.
Worst Art: Soulblast
I just don't like this art simply because it looks too silly. It really looks like the creature being burned is screaming "I'm meeeellllllttttingg...!" and it looks really cartoony. I know that Wayne was trying to go for an image of horrific burning, but it just doesn't fit. Also, the three guys in the bottom left look like they're calling a football game.
Most Ill-Suited: Tariel, Reckoner of Souls
Metal? Yes. Awesome? Yes. Does it make sense? No. This art is just too full of lines and tassels, almost to the point of looking like a Rob Liefeld character from the 90s. I just think a much cleaner and neater picture would have done a lot better.
And those are my thoughts on Wayne Reynolds. Wayne, if you're reading, keep doing what you're doing. You're easily one of the best artists for Magic right now.