Requires

Inalla, Archmage Ritualist must be on the battlefield, or in the command zone. Timestream Navigator must be in hand. Crystal Shard must be on the battlefield. You have the City's Blessing or have at least eight permanents on the battlefield. Mana needed:

Steps

1. Cast Timestream Navigator by paying .
2. Timestream Navigator enters the battlefield, triggering Inalla; pay to make a token copy of Timestream Navigator with haste.
3. Activate the token Timestream Navigator by paying , tapping it, and putting it on the bottom of your library, taking an extra turn after this one.
4. Activate Crystal Shard by paying and tapping it, returning the original Timestream Navigator to your hand.
5. Repeat each turn.

Results