Upon checking on the last major Magic: the Gathering events on the MTG Top 8 website, I came upon one decklist that seemed to only benefit one specific Companion creature from Ikoria. That means that the list is mostly composed of cards from the previous set, not minding the other new mechanics offered by the lair of behemoths.

The deck is the Green White Selesnya Auras with All that Glitters as its centerpiece card. It was piloted by username Emrakul and finished in 30 pts (10 wins) in the Mythic Qualifier Zendikar Rising for the month of May.

The companion card used is Lurrus of the Dream-Den which makes sure that the late game discarded auras are reused.

Here below is the full decklist:

Source:
https://www.mtgtop8.com/event?e=25776&d=392111&f=ST&show_pts=Y