Can Draven Vanquisher's ability be activated multiple times in one turn by recycling multiple gold tokens or red runes at the same time to get +4 power in a single combat?

Ruling: No, you get one opportunity to pay the cost per first time Draven is declared attacker or defender in a combat. You need multiple combats in the same turn to stack the bonus one at a time.

Sequence:

• Draven's triggered ability triggers the first time he gains the attacker or defender designation each combat
• When you resolve his triggered ability, you can pay the cost to get +2 power
• To use the ability multiple times in one turn, you need multiple separate combats

Nuances:

• The ability can be used at any point during combat when it triggers, not just at the start