Karador, Ghost Chieftain + Timestream Navigator + Isochron Scepter + Entomb

Karador, Ghost Chieftain

Timestream Navigator

Isochron Scepter

Entomb

How it works

1. Activate Timestream Navigator by paying 2, tapping it and putting it from the battlefield onto the bottom of your library, causing you to take an extra turn after this one.
2. Activate Isochron Scepter by paying 2 and tapping it, casting a copy of Entomb without paying its mana cost.
3. Resolve Entomb, searching your library for Timestream Navigator and putting it into your graveyard.
4. Cast Timestream Navigator from your graveyard by paying 1.
5. Repeat each turn.