Shouldn't be too hard probably lol
No, it would be that it taps one creature and would cost you a mana, unless you have other cards in play that make the ability cheaper and untap
Earthcraft become Tap target creature: Untap target basic land.
Tap opponents creature net a mana off a basic
Yeah, you still have to pay 2 mana and tap Imp’s Scissors to use is ability
you pay 2 mana once to make earthcraft target anything, then you tap one of your opponents creatures and untap one of your own lands, than rinse and repeat