Timestream Navigator
Cellar Door
Celestine, the Living Saint

   Prerequisites

What do I need to start this combo?
All permanents on the battlefield.
Timestream Navigator and Celestine do not have summoning sickness. Opponents cannot block and kill Celestine. You have the city's blessing.
5 each turn available

   Steps

How does this combo work?
1
Activate Timestream Navigator by paying 2, tapping it, and putting it on the bottom of your library, causing you to take an extra turn after this one.
2
Activate Cellar Door by paying 3 and tapping it, targeting yourself, putting Timestream Navigator from the bottom of your library into your graveyard and creating a 2/2 Zombie token.
3
Declare Celestine as an attacker, dealing 3 damage and gaining 3 life when she does combat damage.
4
At the beginning of your end step, Celestine triggers, returning Timestream Navigator from your graveyard to the battlefield.
5
Move to your next turn.
6
Repeat.

   Results

What do I get from this combo?
Infinite turns
Lock