Side Quest (UST) from Unstable, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Alex Konstad
• Card Text:
  Target player in a silver-bordered game you can see from your seat gains control of target creature you control until your next turn. At the beginning of your next upkeep, put two +1/+1 counters on that creature. (A creature is on the battlefield of only the game its controller is playing.)