Feroz, Ulgrotha's Warden, Felidar Guardian, Cloudstone Curio, and Oath of Teferi

Prerequisites

• Feroz, Ulgrotha's Warden on the battlefield
• Felidar Guardian in hand or in the library
• Cloudstone Curio on the battlefield
• Oath of Teferi on the battlefield

Steps

1. Activate Feroz's second loyalty ability by putting zero loyalty counters on it, causing you to draw a card and put Felidar Guardian from your hand onto the battlefield
2. When Felidar Guardian enters, it and Cloudstone Curio trigger
3. Resolve the Cloudstone Curio trigger, returning nothing to your hand
4. Resolve the Felidar Guardian trigger, blinking Feroz
5. When Feroz enters, Cloudstone Curio triggers, returning nothing to your hand
6. Activate Feroz's first loyalty ability by putting two loyalty counters on it, creating two 1/1 Bird creature tokens with flying
7. When the Birds enter, Cloudstone Curio triggers
8. Choose to return Felidar Guardian from the battlefield to your hand with one trigger, and nothing to your hand with the other trigger
9. Repeat

Results

• Infinite card draw
• Infinite draw triggers
• Near-infinite creature ETB
• Near-infinite creature LTB
• Near-infinite creature tokens