Ability: Reward

[Ravenchild]

Type: Rule
Whenever a unit destroys another unit in Battle in a one-on-one fight, the unit's reward ability is activated.

Examples:
Reward: Gain 1 gold (take the top card from your card stack as a new ressource card)
Reward: this turn: +1/+1 (unit gets +1/+1 until end of turn
Reward: Draw a card
Reward: Prevent 2 damage to another unit
Reward: Unmark a unit
...

[pennomi]

I like this idea, though I would imagine that it might be mostly common in the House of Nobles cards.