Ulalek, Fused Atrocity, Lithoform Engine, and Writhing Chrysalis

Prerequisites

• Ulalek, Fused Atrocity on the battlefield
• Lithoform Engine on the battlefield
• Writhing Chrysalis in hand
• available

Steps

1. Cast Writhing Chrysalis by paying
2. Ulalek and Writhing Chrysalis' first ability trigger
3. Holding priority, activate Lithoform Engine's first ability by paying and tapping it, copying Ulalek's trigger
4. Resolve the copy of Ulalek's trigger, causing you to pay to copy the Writhing Chrysalis spell, Ulalek's trigger and Writhing Chrysalis' trigger
5. Resolve the copy of the Writhing Chrysalis spell
6. Resolve the copy of Writhing Chrysalis' trigger, creating two 0/1 Eldrazi Spawn creature tokens
7. Activate both Eldrazi Spawn creature tokens by sacrificing it, adding
8. Each Writhing Chrysalis you control triggers twice, putting two +1/+1 counters on each of them
9. Resolve the copy of Ulalek's trigger from step 4, causing you to pay to copy the Writhing Chrysalis spell, Ulalek's trigger and Writhing Chrysalis' trigger
10. Repeat from step 5

Results

• Infinite +1/+1 counters on an infinite number of creature tokens
• Infinite copies of abilities you control on the stack
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers