Tom, Bert, and William, March of the Machines, and Shilgengar, Sire of Famine

Prerequisites

• Tom, Bert, and William on the battlefield
• March of the Machines on the battlefield
• Shilgengar, Sire of Famine on the battlefield

Steps

1. Activate Shilgengar by sacrificing Tom, Bert, and William
2. When Tom, Bert, and William die, they trigger, returning them from your graveyard to the battlefield as a noncreature artifact
3. Because Tom, Bert, and William enter as a noncreature artifact, March of the Machines will then cause Tom, Bert, and William to be a 5/5 artifact creature
4. Resolve the Shilgengar ability
5. Repeat
6. Activate Shilgengar's first ability by sacrificing another creature, creating a Blood token
7. The Blood token enters the battlefield as a 0/0 creature due to March of the Machines, and will have its toughness boosted by the permanent specified in the pre-requisites to prevent it from dying
8. Repeat

Results

• Infinite Blood tokens
• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers