Six
Legendary Creature — Treefolk
Reach
Whenever Six attacks, mill three cards. You may put a land card from among them into your hand.
During your turn, nonland permanent cards in your graveyard have retrace. (You may cast permanent cards from your graveyard by discarding a land card in addition to paying their other costs.)
Andrew Mar
Modern Horizons 3 Promos (PMH3)
• #169sRulings
If a spell you cast with retrace is countered, it's put back into your graveyard. You may use the retrace ability to cast it again.
(wotc • 2024-06-07)
Rulings
If a spell you cast with retrace is countered, it's put back into your graveyard. You may use the retrace ability to cast it again.
(wotc • 2024-06-07)