Badgermole Cub

An ability that triggers "whenever you tap a creature for mana" triggers only if you activate a mana ability of a creature including tap in its cost. Mana abilities that don't include the tap symbol and instead say "Tap an untapped creature you control" or similar won't cause Badgermole Cub's second ability to trigger. Similarly, it won't trigger if you tap a creature to activate a mana ability of another object (even if that mana ability also includes tap ).

"Earthbend N" means "Target land you control becomes a 0/0 land creature with haste in addition to its other types. Put N +1/+1 counters on it. When it dies or is exiled, return it to the battlefield tapped under your control."

Earthbend doesn't give the land you control a color. As most lands are colorless, in most cases the resulting land creature will also be colorless.