The Sixth Doctor, Romana II, and Teferi, Who Slows the Sunset

Prerequisites

• The Sixth Doctor on the battlefield
• Romana II on the battlefield
• Teferi, Who Slows the Sunset in hand
• Romana II does not have summoning sickness
• You control a mana-producing land and/or artifact
• available

Steps

1. Cast Teferi by paying
2. The Sixth Doctor triggers, copying the Teferi spell, with the copy being nonlegendary
3. Resolve both Teferi spells
4. Activate a mana-producing land or artifact by tapping it, adding at least
5. Activate Romana II by paying and tapping it, creating a copy of the Teferi token
6. Activate a Teferi token's first loyalty ability by putting a loyalty counter on it, untapping Romana II, the mana-producing land or artifact and up to one other land or artifact, and causing you to gain 2 life
7. Repeat from step 4

Results

• Infinite lifegain
• Infinite lifegain triggers
• Infinite mana artifacts you control can produce
• Infinite mana lands you control can produce
• Infinite Teferi, Who Slows the Sunset tokens
• Infinite untap of artifacts you control
• Infinite untap of lands you control