I've been having fun playing around with really powerful mids.
I moved from Vlad to Kennen, Leblanc of course, basically every mid possible.
Surprisingly, the one I found that wrecks 90% of other mids out there, and scales amazing to the end, is the one and only Ryze heh.
Been playing him religiously, and its been quite entertaining to not have yet met a mid that I couldn't dominate or had to be babysit by his jungler constantly.
fight against cass on ryze yet?
Funny enough I have not met a cass yet. Any other mid that has a strong start begins to putter out when I get my tear/revolver, that little bit of spell vamp + ult + masteries is enough to do serious damage and sustainability.
Build order for me is regular boots > tear > sorc boots > revolver > depending on how things are going, I get the HP/MP for banshee's or the glacial shard for frozen heart, or i straight upgrade to will of the ancients.
Basically get pieces of everything that enhance health/mana, and slowly build them to final end pieces. My final build on him which i've built it fully once, is Sorc boots/ AA staff/ Rod of Ages / Banshee's veil / Frozen heart / Will of the ancients.
Being at one shred of life and moving to full with a good ult was so satisfying