Enigmatic Incarnation + Timestream Navigator + Rancor

Enigmatic Incarnation

Timestream Navigator

Rancor

How it works

1. Activate Timestream Navigator by paying 2, tapping it and putting it onto the bottom of your library, causing you to take an extra turn after this one.
2. At the beginning of your end step, Enigmatic Incarnation triggers, causing you to sacrifice Rancor and then search your library for Timestream Navigator and put it onto the battlefield.
3. Rancor triggers, returning itself from your graveyard to your hand.
4. Move to your next turn.
5. Cast Rancor by paying , attaching it to any other creature you control.
6. Repeat.