Estrid, the Masked, and The Peregrine Dynamo

Prerequisites

• Estrid, the Masked on the battlefield
• The Peregrine Dynamo on the battlefield
• Enchanted permanents you control can tap to produce at least
• Estrid is not your commander
• The Peregrine Dynamo is enchanted

Steps

1. Activate Estrid's first loyalty ability by putting two loyalty counters on it
2. Holding priority, activate all mana-producing enchanted permanents you control by tapping them, adding at least
3. Activate The Peregrine Dynamo by paying and tapping it, copying Estrid's ability
4. Resolve the copy of Estrid's ability, untapping all enchanted permanents you control
5. Repeat from step 2

Results

• Infinite mana enchanted permanents you control can produce
• Infinite untap of enchanted permanents you control