Saheeli Rai, and Felidar Guardian

Prerequisites

• Saheeli Rai on the battlefield
• Felidar Guardian on the battlefield
• Saheeli Rai has at least three loyalty counters on it

Steps

1. Activate Saheeli Rai's second loyalty ability by removing two loyalty counters from it, creating a token copy of Felidar Guardian that is an artifact in addition to its other types and has haste
2. The Felidar Guardian token enters the battlefield, blinking Saheeli Rai
3. Repeat

Results

• Infinite creature tokens with haste
• Infinite ETB