Goblin Welder, and Intruder Alarm

Prerequisites

• Goblin Welder on the battlefield
• Intruder Alarm on the battlefield
• Goblin Welder does not have summoning sickness
• You control at least one nontoken artifact creature
• You have at least one artifact creature in your graveyard

Steps

1. Activate Goblin Welder by tapping it, sacrificing any artifact creature you control and returning any other artifact creature from your graveyard to the battlefield
2. Intruder Alarm triggers, untapping all creatures
3. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mana creatures you control can produce
• Infinite sacrifice triggers
• Infinite untap of all creatures