We've got a client update today that fixes issues with Modal DFCs, Thieving Skydiver, and Terror of the Peaks.

Quote From MTG Arena Admin

  • Players can no longer add modal double-faced cards (MDFCs) to Brawl decks if the color identity of the back face does not match their Commander.
  • Fires of Invention no longer counts the back faces of MDFCs for the number of lands you control.
  • Colorless spells with "x" in their mana cost are now highlighted in-hand when they are castable.
  • Thieving Skydiver's kicker ability now functions correctly when casting it from the graveyard (e.g. Lurrus of the Dream-Den is on the battlefield).
  • Players should no longer experience an unexpected match complete when controlling multiple copies of Terror of the Peaks if one is targeted by a spell.

But Wait, There's More!

Wizards has also stated that they are monitoring Standard and will provide an update on the format next week.

Quote From @wizards_magic

We're closely monitoring developments in Standard. In order to avoid disrupting this weekend's tournaments, we intend to provide an update on the format early next week.