Maralen of the Mornsong, Timestream Navigator, Batterskull, and Concordant Crossroads

Prerequisites

• Maralen of the Mornsong on the battlefield
• Timestream Navigator in the library
• Batterskull on the battlefield
• Concordant Crossroads on the battlefield
• Batterskull attached to Maralen
• Your life total is at least four
• An opponent cannot block and kill Maralen
• You control nine permanents and/or have the city's blessing
• each turn available

Steps

1. At the beginning of your upkeep, Maralen triggers, causing you to lose three life and search your library for Timestream Navigator and put it into your hand
2. Cast Timestream Navigator by paying
3. If you don't have the city's blessing, Timestream Navigator triggers, causing you to get the city's blessing
4. Activate Timestream Navigator by paying , tapping and putting it on the bottom of your library, causing you to take an extra turn after this one
5. Deal combat damage with Maralen, causing you to gain at least six life
6. Repeat each turn

Results

• Infinite turns