That was a pretty stacked league run, but still only went 4-1 because variance is a harsh mistress:

R1: Julian Knab on regular Elves 2-0
R2: Colorless Eldrazi 1-2 (G2 & G3 were some of the most unreal draws I've ever seen in my entire Magic career. You could free Demonic Tutor every turn and not draw any better than that guy. )
R3: Junk Nic Fit 2-0
R4: Jeskai Stoneblade 2-1 (Ziggy Stardust from the Legacy Mediocre League)
R5: Joe Lossett Legendary Miracles 2-1 (G1 I was lucky he didn't set up Terminus as I had a T3 overkill. G2 I had a slow hand after a mull, which didn't matter since he had T3 B2B anyway. G3 I had another ridiculous good start (his rest hand was SDT and 2x STP). Karma for what happened in R2.)