As Journey into Nyx arrives, choose Elspeth or Heliod.
• Elspeth — When Journey into Nyx arrives, create two 1/1 white Soldier creature tokens. Those tokens get +1/+1 for as long as you control Journey into Nyx.
• Heliod — When Journey into Nyx arrives, exile target non-enchantment permanent until Journey into Nyx leaves the battlefield.
See Challenge # 165.