Phantom Steed + Time Stretch + Ardent Elementalist Combo

Phantom Steed on the battlefield.

Ardent Elementalist in exile.

Time Stretch in hand.

Ardent Elementalist is exiled by Phantom Steed.

An opponent cannot block and kill Phantom Steed.

each other turn available

Cast Time Stretch by paying its mana cost, causing you to take two extra turns after this one

Declare Phantom Steed as an attacker. It triggers, creating a token copy of Ardent Elementalist that's tapped and attacking.

When the Ardent Elementalist token enters, it triggers, returning Time Stretch from your graveyard to your hand.

Repeat during your second extra turn.

Infinite turns

Lock