How many times can Gotsdam, The Tired Warrior strike:Combat ends in a turn?

We are in a discussion.

The ability of Gotsdam, The Tired Warrior "pay 1 blood. Strike combat ends" can be used

Every time he can strike?
One per combat?
One per turn?

Name: Gotsdam, The Tired Warrior
[KoT:PV2/B2]
Cardtype: Vampire
Clan: Ventrue
Group: 4
Capacity: 9
Discipline: ani AUS DOM FOR PRE
Camarilla: Gotsdam can burn 1 blood to strike: combat ends. He treats aggravated damage as normal damage in combat. Frenzy cards cannot be played on him.
Artist: Jim Di Bartolo

His nickname should have been The Tiring Warrior instead.

I had 4 different Gotsdam decks at one point, but after lilliths blessing got the axe, I couldn't put Thaum on him regularly (weather control dawn op or burst of sunlight....) and he became a utility star in a typical!ventrue style grinder thing.

But.
He laughs at war ghouls, shambling hordes, garou, deep song rush, agg poke, and rotschrek.

His agg and frenzy proof text can totally stop certain (trujah agg as a pre?) Decks cold. But the non-untapping SCE that costs a blood? Any combat deck that can't deal with that probably can't deal with half the earth melding meta. He's normally at 5 ish blood and can't sce when empty.