Timestream Navigator + Flameshadow Conjuring + Riptide Laboratory

Prerequisites

• You have the city's blessing and/or control at least eight permanents.

Steps

1. 1Cast Timestream Navigator by paying .
2. 2If you don't have the city's blessing and control ten or more permanents, Timestream Navigator gives you the city's blessing.
3. 3When Timestream Navigator enters the battlefield, Flameshadow Conjuring triggers, causing you to pay to create a token copy of Timestream Navigator with haste.
4. 4If you don't have the city's blessing, the Timestream Navigator token gives you the city's blessing.
5. 5Activate Crystal Shard by paying or and tapping it, returning the nontoken Timestream Navigator to your hand from the battlefield.
6. 6Activate the Timestream Navigator token by paying , tapping it and putting it on the bottom of your library from the battlefield, causing you to take an extra turn after this one.
7. 7Repeat each turn.

Effects

• Infinite turns
• Lock