Woe Strider, Trapjaw Kelpie, and Thran Vigil

Prerequisites

• Woe Strider on the battlefield
• Trapjaw Kelpie on the battlefield
• Thran Vigil on the battlefield

Steps

1. Activate Woe Strider by sacrificing Trapjaw Kelpie
2. When Trapjaw Kelpie dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. Thran Vigil triggers, putting a +1/+1 counter on Trapjaw Kelpie
4. Resolve the Woe Strider ability
5. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers
• Infinite scry 1