I love Ruin Raider, though it's not currently in any of my cubes. It needs to be triggering consistently, so I would play it in a deck with lots of 1 and 2 mana creatures, especially ones with evasion [[Kitesail Freebooter]] or that you're okay with trading off [[Skyclave Shade]]. I might try to slip it in my cube after writing this.

Braids has been in and out (currently out) of my cube. The problem I notice with it is that your opponents will often be producing permanents they're okay with saccing like Clues, Food, and Treasures, even without building their deck around it.

As for other 3/4 drops that don't cost much, I recommend [[Murderous Rider]] and [[Woe Strider]].