Karn, Silver Golem, Salvaging Station, and Darksteel Citadel

Prerequisites

• Karn, Silver Golem on the battlefield
• Salvaging Station on the battlefield
• Darksteel Citadel on the battlefield

Steps

1. Activate Darksteel Citadel by tapping it, adding
2. Activate Karn by paying , causing Darksteel Citadel to become a creature until end of turn
3. Darksteel Citadel dies as a state-based action due to having 0 toughness, triggering Salvaging Station, untapping Salvaging Station
4. Activate Salvaging Station by tapping it, returning Darksteel Citadel from your graveyard to the battlefield
5. Repeat

Results

• Infinite LTB
• Infinite death triggers
• Infinite landfall triggers