God-Eternal Kefnet + Jace, the Mind Sculptor + Karn's Temporal Sundering

God-Eternal Kefnet

Jace, the Mind Sculptor

Karn's Temporal Sundering

How it works

1. Activate Jace's zero loyalty ability, putting Karn's Temporal Sundering on top of your library.
2. Pass the turn.
3. On your next draw step, when you draw Karn's Temporal Sundering, reveal it due to Kefnet's ability, making a copy that costs 2 less to cast.
4. Cast the copy for 2, granting you an extra turn and returning up to one nonland permanent to its owner's hand.