Gideon, Martial Paragon, and The Peregrine Dynamo

Prerequisites

• Gideon, Martial Paragon on the battlefield
• The Peregrine Dynamo on the battlefield

Steps

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

Results

• Infinitely large creatures until end of turn
• Infinite mana creatures you control can produce
• Infinite untap of creatures you control