If this card is Normal Summoned: Target 1 monster your opponent controls; during your third Standby Phase after this effect's activation, destroy that monster. This card cannot be destroyed by battle while the targeted monster is on the field.
I've been play testing with this card and a few bits of advice for those who are thinking about using him.
First, it's really a GREAT stall card if used at the right time and in the right way. I've had a lot of success farming Mai with this thing. It can easily give me several turns to set up my combo.
First, it's useless against decks stacking monster removal, so just pitch it against those decks (set, discard, whatever).
Second, have a way of getting it to defense mode right away, like Curse of Anubis. It's way too easy to push a lot of damage through on the first turn you normal summon.
Third, get some mileage out of it by using things like staunch defender or ring of magnetism. Also, relieve monster has a place here IMO.
Fourth, the easiest way to get around Viser Des is to tribute the target monster and the AI will figure this out. I highly recommend keeping a Blast Held By A Tribute in the deck as it's bound to come up.
Finally, remember that this is a stall card. Like any stall strategy, the stall WILL NOT win the game for you. Just some general advice here, but you must have some sort of win condition that you're stalling for, probably some off-the-wall combo but burn decks actually do pretty well in this case as well maybe with Lava Golem.
Hey just a tip for people looking to farm the level 30 Marik with cerebrus.
Other than the obvious choices like tribute to the doomed to counter this. You can also use "Murmur of the Forest" from the card trader, which flips this card to face down defense position and will cancel his effect completely.
Also - Murmur is great for cerebrus if you use a field spell like "yami", because it can return your FS to your hand allowing you to use it again for an additional counter. Good luck guys!