Vajra
Vajra is a common relic that grants 1 Strength at the start of each combat. Strength increases all attack damage by 1 per stack per hit, so starting every fight with 1 free Strength provides a passive damage bonus that applies to every attack you play throughout the combat.
The value of Vajra scales with how attack-heavy your deck is and how many hits you land per fight. In builds that play many attacks per turn, the 1 Strength bonus multiplies across every hit, making it more impactful than its small number suggests. It is weaker in non-attack builds and less impressive in Defect's orb-focused strategies. Vajra is a consistent common that works for any attack-oriented build and is especially synergistic with other Strength-scaling relics and cards like Inflame, Limit Break, or Spot Weakness.