Choose one â€”
â€¢ Target opponent exiles a creature they control.
â€¢ Target opponent reveals their hand. You choose a nonland card from it. Exile that card.
If you choose Doomfallâ€™s second mode, you must exile a nonland card from that playerâ€™s hand if able. If you canâ€™t, most likely because that playerâ€™s hand contains only land cards, nothing happens. That player wonâ€™t exile a creature they control instead.
If you choose Doomfallâ€™s first mode, the target opponent chooses which creature to exile. That creature isnâ€™t targeted, so a creature with hexproof can be exiled this way.