Sekki, Seasons' Guide, Blasting Station, and Chatterfang, Squirrel General

Prerequisites

• Sekki, Seasons' Guide on the battlefield
• Blasting Station on the battlefield
• Chatterfang, Squirrel General on the battlefield

Steps

1. Activate Blasting Station by tapping it and sacrificing another creature, targeting Sekki
2. Sekki will prevent the 1 damage that would be dealt to it and instead removes a +1/+1 counter from it and creates a 1/1 Squirrel and a 1/1 Spirit creature token
3. When the Spirit and Squirrel enter, Blasting Station triggers twice, untapping Blasting Station
4. Repeat step 1, sacrificing the Squirrel token, until Sekki dies as a state-based action due to having 0 toughness
5. Activate Sekki by sacrificing eight Spirits, returning it from your graveyard to the battlefield
6. When Sekki enters, Blasting Station triggers, untapping Blasting Station
7. Repeat

Results

• Infinite LTB
• Infinite ETB