MTG Combo: Argothian Elder + Jungle Basin + Wirewood Lodge
Simple infinite colourless mana combo. Tap Jungle Basin and Wirewood Lodge for 3 mana. Tap Argothian Elder to untap them both. Tap Jungle Basin for another 2 mana, spend the green mana for Wirewood Lodge's tap activated ability to untap Argothian Elder. Repeat for infinite colourless mana.
This works for any land that generates 2 more mana, with at least one of them being . The Ravnican Karoo lands work best with this.