You need these faction levels to unlock the cards. You can achieve that by playing against the AI.
Lvl 2 needed for Divine Bond
Lvl 4 for Silverguard Knight
Lvl 7 for Martyrdom
Lvl 10 to get Tempest
Tempest is really important as a cheap way to clear board and sometimes for some extra face damage.
Taken from my only basics deck lists:
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Bond Argeon 2k spirit by Kieran
Argeon 1k spirit by Rhacker
Budget Bond deck for only 420 spirit built by an unknown deckbuilder. Use that deck on your first day of playing!
A take on the classic tempo Argeon. It was hailed as one of the oppressors of the game at one point wreaking havoc on ladder and tournaments. Patch 1.96.12
Bond Argeon 2k spirit by AlphaCentury
Stick some of the Huge HP pools available to Lyonar, and then translate that into scary burst damage with Divine Bond.
Bond Argeon 2k spirit by Rhacker
This deck tries to control board with spells and minions while keeping its own health up and slowly but surely kill its opponent.
A long-time ladder favorite featuring the burst of aggro with unparalleled AOE, card draw, and heal sustain strong enough to make most control decks jealous.