Feats in DnD are pretty powerful. Let’s look at splashing a bit of each class around!
Rogue Training
You’ve trained a bit in the ways of the street. Gain the following benefits:
- Gain proficiency in one of the skills rogues gains proficiency in.
- Gain a proficiency in one saving throw a rogue is proficient in.
- Gain sneak attack equal to a rogue of 1/4 your level, rounded down, to a minimum of 1d6 damage.
- You count as a rogue for all future class abilities, feats, etc.
Thoughts? Is this too powerful?
Throat Punch Games 
Too powerful. Even when multiclassing in 5e, you don’t get another saving throw. Take that out and the qualification as a rogue and it would seem balanced.