Love the idea, reminds me of traps from the Yu-Gi-Oh! series. I think more cards like this should be implemented, with trap-like features, such as an
Pit \ Trap Hole, where the played creature is buried or an
Splice \ Elite Splice, where the last played creature is destroyed but X amount of 1|1 (destroyed creature) are summoned, all are lobotomized and where X is equal to the creature's HP.
As an extra feature, and if more trap-like cards are implemented, there should also be a way to hide your permanents from view when they are played. This concept would fit in perfectly with Warlock's Orb. This would give
and
new fields of suggestion and cards such as Precognition and Golden Nymph would be much more useful.