Twitch Buffs
Okay, it's a start, but it misses the mark. Rat doesn't have many (almost any) mana issues. I think reducing the cost on Ambush is a decent idea considering it's...well...bad. BUT! That doesn't change the fact that 5 seconds to wait cause a minion sneezed on you is fair. It's still dumb, but okay.
The Twitch ult damage buff is REALLY NICE, but it's...sigh It's probably going to signal overtuned. People will bitch about it once they play against it.
QoL changes
Rat-ta-tat-tat renamed to Spray n' Pray
Contaminate renamed to Fester (as Expunge still doesn't make sense)