I loved Kithros' mass Lavaspout that would just drain your timer while shutting all counterplay down with antispells.
Anything that lets an actual game take place, rather than just shrinerushing. (so, like 5% of pvp games )
My favourite bg for myself is my magic amp but a player made bg would probably have to be necromoga to me that was the pivotal moment where I fell in love with poxnora officially. Watching Shazara blast trough tough IS meta with moga was something I wish everyone could have witnessed.
Menaman's build pre-revamp, it was centered on Mena. Mena got up to 25 to 30 damage per hit at 8 range, but he rarely won with it.
I was always a fan of superchamp decks, mostly because the people that play them cry the hardest when I kill their superchamp.
The old OLD Nora Surge/Dawn of Element FS/SL. It wasn't a crazy trick deck or hella op (well kinda), it just ran super smooth. Also, Botanist+Dragonclaw was ballin
FS/SL reached faceroll status 2/3 exp later. Basically, I ran it before it was cool. The faceroll SL split around that time was the Acid Ele/Mirror/Elite Blade pile of win.
VP + Shroom. Beats it all out of the water. The one time I gladly were a bug abuser, although I didn't win or itnend to win anything with it
Back in the day, when you Vertical Pushed a Sporegill, it would start raining them in an AE 5 or so until every space was covered.