Delina, Wild Mage, Ashnod's Altar, Lithoform Engine, and Corridor Monitor

Prerequisites

• Delina, Wild Mage on the battlefield
• Ashnod's Altar on the battlefield
• Lithoform Engine on the battlefield
• Corridor Monitor on the battlefield
• Delina does not have summoning sickness
• available

Steps

1. Declare Delina as an attacker, triggering its ability, targeting any creature
2. Holding priority, activate Lithoform Engine's first ability by paying and tapping it, copying Delina's trigger, with the copy targeting Corridor Monitor
3. Resolve the copy of Delina's trigger, creating at least one token copy of Corridor Monitor that is tapped and attacking
4. When the Corridor Monitor token(s) enter the battlefield, they trigger, untapping Lithoform Engine and up to one other applicable permanent for each remaining trigger
5. Activate Ashnod's Altar by sacrificing a Corridor Monitor token, adding
6. Repeat from step 2

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite colorless mana
• Infinite mana artifacts you control can produce
• Infinite untap of artifacts you control
• Infinite copies of abilities you control on the stack
• Infinite untap of creatures you control
• Infinite mana creatures you control can produce
• Infinite tapped creature tokens that are attacking