Arthur, Marigold Knight, Preston, the Vanisher, Scroll Rack, and Felidar Guardian

Prerequisites

• Arthur, Marigold Knight on the battlefield
• Preston, the Vanisher on the battlefield
• Scroll Rack on the battlefield
• Felidar Guardian in hand
• available

Steps

1. Activate Scroll Rack by paying and tapping it, exiling Felidar Guardian from your hand face down, then putting the top card of your library into your hand and putting Felidar Guardian onto the top of your library
2. Declare Arthur and another creature as attackers, triggering Arthur, looking at the top six cards of your library and putting Felidar Guardian onto the battlefield tapped and attacking
3. When Felidar Guardian enters, it and Preston trigger
4. Resolve the Felidar Guardian trigger, blinking another permanent you control
5. Resolve the Preston trigger, creating a token copy of Felidar Guardian that is a 0/1 Illusion
6. When the Felidar Guardian token enters the battlefield, it triggers, blinking the nontoken Felidar Guardian
7. Repeat from step 3

Results

• Infinite LTB
• Infinite ETB
• Infinite creature tokens
• Infinite landfall triggers
• Infinite blinking of permanents you control
• Infinite mana lands you control that enter the battlefield untapped can produce
• Exile any number of nonland permanents