They are available through other means, which will be detailed below
I built Rakdos crimes and outlaws, and while I am dreadful at Sealed, I did end up winning the games I played whenever Gisa got out
And its not actually that bad
Conclusion For a set thats not specifically designed around typal strategies, unlike, say, Onslaught or OG Lorwyn , there are a lot of strong typal cards in the Avatar set
Spread the Sickness and Whisper of the Dross sub in for a typical Murder, Infectious Inquiry appears instead of Sign in Blood, and Phyresis Outbreak (not technically proliferate, but its the same outcome) takes the spot of a Mutilate or Crippling Fear
The Saga mechanic from the upcoming set Dominaria seems like a great mechanic, but creates a new visual layout for the card the text box is over the card type, for example while it makes it more unique it also adds cognitive noise