Play only when another player is to draw a spoils of victory. That player must draw and discard his spoils, while this player draws a card showing it to all players. If it is a realm card, it is sent to the Abyss. Otherwise it may be played just like a spoils of victory.
Copyrights:
TSR
Wizards of the Coast
This is an interesting card for those interested in using thief skills. When an opponent razes a realm (or does something else to earn a spoils of victory), you may force that person to discard that spoils (note: a person can't just wait to see if the spoils is played and THEN use the card; using this card happens just as the spoils is drawn and before it is played).
This can be powerful, but there are lots of cards to discard cards from hand or play. Killing one isn't a huge deal (aside from angering whoever just got hit by this card).
It also lets you draw a spoils of victory. However, if it is a realm, it is sent to the Abyss. This prevent people from stealing spoils like they can with The Noble Outlaw (91/BR).
The chance of losing one of the few realms in your deck to the Abyss, especially when many good combos can send many more realms to the Abyss is a huge danger and may just be doing your opponents' work for them.
All in all, this is too much risk for just one cards in card advantage (1 they discard and 1 you draw, but minus this one card).