ALL RIGHT, enter Mega Excadrill!
So, straight up, this thing is NOT for OU, it's for Ubers. Yea. Because, you see, it gets Arena Trap!
Makes sense, right? Why should a dumb thing like duggy get it while a real mole doesn't? So MegaDrill here can do some serious trapping. And boy, won't it put those massive drills to use! This thing is bulkier, naturally faster to compensate for the loss of Sand Rush, and has HUGE attack, because it is built for one significant purpose: trapping and eliminating Ubers Titans, in particular that plague of all overcentralising plagues, Primal Groudon!
Here be the stats:
Base form: 110/135/60/50/65/88 =508
MEGA form: 110/165/90/50/85/108 =608
Absolutely terrifying, isn't it? It gets a noticeable increase in bulk (110/90/85 is Garchomp-level fatness) and it can use it to take a few resisted knocks like Ekiller's Extreme Speed, a stray Moonblast or so, and of course, Rock moves are eaten well. This is complemented by a good rise in speed from a subpar 88 (lower than the base 90 mark in Ubers, thus forcing it to rely on sand) to a great 108, which outspeeds a large chunk of the fat metagame. The phenomenal rise in attack, along with its potential access to Swords Dance, makes it terrifying in battle.
The idea behind it is to be versatile. It can very well make use of Tyranitar to do its sand clean-up job pre-mega, and Mega evolve to trap and kill off the fatter, slower Titans to have the way for, oh, I don't know, an Ekiller or a Mewtwo or something to sweep. It still keeps its Sand Rush speed on the turn it Mega Evolves, so it can nicely checkmate something faster on that turn if sand is up, like a Mega Gengar or a troublesome Mewtwo, and kill it off. The added bulk and trapping power also makes it viable to run moves like Rapid Spin and even Stealth Rock or Toxic.
However, it's not as broken as mega Gengar, because it is not mad fast, and it can't trap things that are off the ground. It also has rather okay bulk by Ubers standards, really, and no recovery either, so it's not going to take hits that well. And because it can't hold an item, its power is not very different from regular LO Drill's. Setting up an SD is also easier said that done.
As for the drawing itself, I took an Excadrill and combined it with an earth-moving equipment, really. the body is much bulkier, with the head-part becoming a massive drill that bites through the earth. Its arms become hugely muscled, like Mega Heracross's, and its claws transform into divisible, semi-retractable drill parts, which can fuse together and rotate like its head-drill, and can also operate independently to act like clawed fingers to slash and hold things, as illustrated. I took a few liberties, of course, like the steel rat-like tail and the red patterns on its body transforming into stripes of some kind that glow when MegaDrill is agitated, and I also added in a fair bit of blood-red jewels encrusted into the seams of its drills. The elbows are additionally strengthened by a metal piledriver, rather like on jackhammers, so they can thrust at the ground (or at an enemy!) with shattering force.
Anyway, there it is. Quite an unfriendly thing to face, really. Watch your step; it could be under you, for all you know!