Herald Difficulty Vision Aarkus help?

Tried to go in there with Colossus but with this new AI he was pretty defensive and didn't want to launch his specials until he got to a Sp2 (unless he had Sp2 bias and I just didn't see it) and ii was pretty much dead with all that block damage. Who is a good counter for this guy?
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MD 3/5
Used the mordo synergy to start with one bar of power.
Fight was done and dusted in 40ish hits, 2 l3s and an sp2 finished him off