Sage of Hours | The Ten Rings | Wizard Class (and one other card)

Cards

If you have six or more cards in hand, activate
Iron-Shield Elf by discarding a card.
Repeat step 1 until you have five or fewer cards in hand.
At the beginning of your end step,
The Ten Rings triggers, causing you to draw cards until you have ten cards in your hand.
Wizard Class triggers for each card drawn, putting that many +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+).