Yannik, Scavenging Sentinel | Sage of Hours

Cards

You control a nontoken creature with power five or greater, or you own a creature with power five or greater that is exiled by
Yannik.

At the beginning of your end step,
Teleportation Circle triggers, blinking
Yannik.
Yannik leaves the battlefield, causing any permanents exiled by it to re-enter the battlefield under their owner's control.
Yannik enters the battlefield, exiling a nontoken creature you control with power five or greater until
Yannik leaves the battlefield, and putting at least five +1/+1 counters on
Sage of Hours.
Activate
Sage of Hours by removing all +1/+1 counters from it, causing you to take at least one extra turn after this one.
Repeat each turn.

This combo has been estimated to be Ruthless (Bracket 4+).