I suggest the following,
break owns crates (crate battle is not lucks its definitely skills,but yea I admit there is a little tendency that the lucks change the game sometimes but its part of the game),
XGem (this map had been almost the #1 regular map at XWIS server),
liquid (several guys mentioned already),
Rasta(too big tho),
GoldRush(too big tho).
You might think crates depends too much lucks. But for example in Ribbon-ORE, whether you showing up at left side or right side is the very much luck.