Bouncy Dirt and Fission Bomb combo:
Cover one side of the interior of a large crater with
Bouncy Dirt and hit the tank with a Fission Bomb while it
is at the bottom of the hole.
Note: Try using Mountain Movers and Crater Makers.
Pile Driver and Hailstorm combo:
Hit the tank with a Pile Driver followed by a Hailstorm
Ground Shocker and Popcorn combo:
Fire a Ground Shocker directly below your opponent's tank
to make the ground very rough. Then, fire a Popcorn nearby
and the bullets will bounce and multiply.
Fire a Digger at a steep angle so your tank slides down
into the ground. Use a dirt weapon to seal yourself in.