Vigilance, menace, lifelink
Whenever Kroxa and Kunoros enters or attacks, you may exile five cards from your graveyard. When you do, return target creature card from your graveyard to the battlefield.
When the Invasion Tree reached the Underworld, it found only teeth and fury.
The last ability of Kroxa and Kunoros triggers and goes on the stack without a target. If you exile five cards from your graveyard, the second “reflexive” triggered ability will trigger. You’ll choose the target creature card for that second ability at that time.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.