I am using currently this lines to kill Cleric, juggler and kelthuzad and avoid to kill enemy nerubian eggs.
Any Card 20 GAIN FOR ATTACK AND TARGET enemy battlefield has card named $(Northshire Cleric) or $(Knife juggler) or $(kel'thuzad)
Any Card -50 GAIN FOR ATTACK AND TARGET enemy battlefield has card named $(Nerubian Egg)
this lines can be used as model for other cards.
Add silencing is easy, just put the card which has silencing abiliy and GAIN FOR CAST AND TARGET the name of the opponents card