Karador, Ghost Chieftain + Slick Imitator + Narset's Reversal + Time Walk

Karador, Ghost Chieftain

Slick Imitator

Narset's Reversal

Time Walk

How it works

1. Cast Time Walk by paying its mana cost.
2. Holding priority, cast Narset's Reversal by paying , targeting Time Walk.
3. Holding priority, activate Slick Imitator by paying 1 and sacrificing it, copying Narset's Reversal, with the copy targeting the original Narset's Reversal.
4. Resolve the copy of Narset's Reversal, copying the original Narset's Reversal targeting Time Walk, and returning the original Narset's Reversal to your hand.
5. Resolve Time Walk, causing you to take an extra turn after this one.
6. Cast Slick Imitator from your graveyard by paying 1.
7. Repeat each turn.