Quicksilver Elemental, Touch of Vitae, and Argothian Elder

Prerequisites

• Quicksilver Elemental on the battlefield
• Touch of Vitae in hand
• Argothian Elder on the battlefield
• available

Steps

1. Cast Touch of Vitae by paying , targeting Argothian Elder
2. Activate two lands by tapping them, adding at least
3. Activate Quicksilver Elemental by paying , causing it to gain Argothian Elder's activated abilities until end of turn
4. Activate Quicksilver Elemental using Argothian Elder's ability by tapping it, untapping two lands
5. Activate Quicksilver Elemental using Argothian Elder's ability granted to it by Touch of Vitae by paying , untapping Quicksilver Elemental
6. Repeat from step 2

Results

• Infinite mana lands you control can produce
• Infinite untap of lands you control