Oros, the Avenger

[Brissan]

When {Oros, the Avenger} attacks you may pay 2W to do 3 damage to each creature without flying. Can you do this more than once of you have the mana or only once per attack?

[Keyeto]

You may do it once every time it damages the opponent.

RESOLVED

[Coffee Vampire]

Combat damage, but close enough

[Malleo]

Non-white not non-flying

[Gorzo]

If I may delve a little deeper into this one, the reason you may only use the effect once is because it is a triggered ability, not an activated ability.

With an activated ability, you have a cost, then an effect. In order to do the effect, all that must be done is pay the cost. Cost and effect in activated abilities are always separated by a colon (see: {Centaur Glade}).

With a triggered ability, a certain event must occur, then an effect may happen. While a triggered ability like Oros here may also include a mana cost, you will notice it does NOT have a colon. Because the triggering event (dealing combat damage) only happens once and instantaneously, the ability can only be used once because it needs another trigger to happen again.

[Birdbrain]

Just give it double strike...while attacking with the boros guild leader.