Craft faction staples, most which are commons/rares. Not going to mention epic/legendary staples however.(These are my opinions) Some cards are budget-friendly wincon.
Lyonar : Azurite Lion, Ironcliffe Guardian, Suntide Maiden, War Judicator.
Songhai : Katara, Mist Dragon Seal, Ki Beholder, Four Winds Magi, Flamewreath.
Vetruvian : Pax, Whisper of the Sands, Dunecaster, Falcius, Fireblaze Obelysk, Sandswirl Reader, Starfire Scarab.
Abyssian : Sphere of Darkness, Grasp of Agony, Void Pulse, Phantasm, Bound Tormentor, Bloodtide Priestess, Shadowdancer.
Magmar : Gro, Young Silithar, Terradon, Earth Sphere, Omniseer.
Vanar : Snow Chaser, Hearth-sister, Razorblade, Frostburn.
Neutral : Zyx, Azure Herald, Golem Metallurgist, Jaxi, Primus Fist, Sojourner, Crossbones (situational, hard counters mechaz0r), Rokadoptrea, Wings of Paradise, Blaze Hound, Blistering Skorn, Lightbender, Sunsteel Defender, Dancing Blades.
Note that most neutral minions are not staples but used frequently.