The developers of the Modern Horizons 3 set in Magic: The Gathering added Six as a legendary treefolk before the Wrenn collaboration.
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The MTG Planeswalker Wrenn was introduced via the first Modern Horizons set as Wrenn and Six. As a Dryad, Wrenn was able to bond with Treefolk. Six, the sixth Treefolk Wrenn bonded with, hails from the plane of Kessig. Treefolk who bonded with Wrenn were never featured on their own MTG card until the release of Modern Horizons 3, which was previewed via MH3 spoilers on May 21st. The legendary Treefolk were allowed to live out their days in peace according to Wrenn, but until now we've never seen Six depicted outside of his bond with Wrenn.
Wrenn and Six feature graveyard shenanigans via the Retrace mechanic and the ability to return a target land from the graveyard to your hand. Six in MH3 also features Retrace, an MTG mechanic that allows you to cast permanent cards from the graveyard by discarding a land, in addition to paying the permanent casting cost.
When Six attacks, you grind three cards, and if a land is rolled, you can put it into your hand. You can only use Retrace when it's your turn and Six is on the battlefield. Six is slightly better than Wrenn and Six, because Retrace was limited to Instant and Sorcery spells on the Planeswalker, while every permanent in the graveyard has Retrace with Six. Expect Six to have a significant impact on the MH3 Draft meta.
