101.3

Any part of an instruction that's impossible to perform is ignored.

Abrupt Decay and Dissolve. Although Abrupt Decay can't be countered, Dissolve's controller still can perform scry 1.

(In many cases the card will specify consequences for this;

Eldrazi Monument.A player who is impossible to perform 'sacrifice a creature' sacrifices Monument.

if it doesn't, there's no effect.)

Murder and Avacyn, Angel of Hope.Murder can't destroy Avacy. Nothing occurs.