You need these faction levels to unlock the cards. You can achieve that by playing against the AI.
Lvl 2 for Daemonic Lure
Lvl 7 for Soulshatter Pact
Taken from my only basics deck lists:
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Want to play the Jax + Razorback combo, but don’t want to play Vanar? Abyssian can do it too. Kinda.
just kill them