Uyo, Silent Prophet, and Doppelgang

Prerequisites

• Uyo, Silent Prophet on the battlefield
• Doppelgang in hand
• You control at least three lands, at least one of which enters the battlefield untapped and can produce at least
• available

Steps

1. Cast Doppelgang by paying , targetting two permanents
2. Holding priority, activate Uyo by paying and returning two lands to your hand, copying Doppelgang, targeting the land and another permanent
3. Resolve the copy of Doppelgang, creating two copies of the land and two copies of the other permanent
4. Activate the two land tokens by tapping them, adding
5. Activate Uyo by paying and returning the two token lands to your hand, copying Doppelgang, targeting the land and another permanent
6. Repeat from step 3

Results

• Infinite LTB
• Infinite ETB
• Infinite death triggers
• Infinite magecraft triggers
• Infinite landfall triggers
• Infinite mana permanents can produce
• Infinite copies of permanents on the battlefield