Kaya the Inexorable + Karn's Temporal Sundering + Doubling Season

Kaya the Inexorable

Karn's Temporal Sundering

Doubling Season

How it works

1. Cast Kaya the Inexorable by paying 3, causing her to enter with ten loyalty counters due to Doubling Season.
2. Activate Kaya's last ability by removing seven loyalty counters, getting her emblem.
3. At the beginning of your next upkeep, the emblem triggers, allowing you to cast Karn's Temporal Sundering from hand, graveyard, or exile without paying its mana cost, gaining an extra turn after this one.
4. Repeat step 3 each turn.