Preston, the Vanisher, Delney, Streetwise Lookout, Sefris of the Hidden Ways, Bloodflow Connoisseur, and Feywild Caretaker

Prerequisites

• Preston, the Vanisher on the battlefield
• Delney, Streetwise Lookout on the battlefield
• Sefris of the Hidden Ways on the battlefield
• Bloodflow Connoisseur on the battlefield
• Feywild Caretaker in the graveyard

Steps

1. Complete a dungeon
2. Sefris' second ability triggers twice due to Delney
3. Resolve the first trigger, returning up to one other creature from your graveyard to the battlefield
4. Resolve the second trigger, returning Feywild Caretaker from your graveyard onto the battlefield
5. When Feywild Caretaker enters, it triggers once and Preston triggers twice due to Delney
6. Holding priority, activate Bloodflow Connoisseur by sacrificing Feywild Caretaker
7. Resolve a Preston trigger, creating a token copy of Feywild Caretaker that is a 0/1 Illusion
8. When the Feywild Caretaker token enters, it triggers twice due to Delney
9. Resolve the Feywild Caretaker token triggers, venturing into Undercity twice
10. Resolve the second Preston trigger from step 5, creating a token copy of Feywild Caretaker that is a 0/1 Illusion
11. Repeat steps 8 and 9 one additional time
12. Resolve the Feywild Caretaker trigger from step 5, venturing into Undercity and completing Undercity
13. Repeat from step 2

Results

• Infinite +1/+1 counters on creatures you control
• Infinite ETB
• Infinite LTB
• Infinite Treasure tokens
• Infinite card draw
• Infinite colored mana
• Infinite creature tokens
• Infinite death triggers
• Infinite draw triggers
• Infinite sacrifice triggers
• Near-infinite lifeloss
• Put all basic lands from your library into your hand
• Put all creature cards from your library onto the battlefield
• Return most creature cards from your graveyard onto the battlefield