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Describe the Bug:
The Additionnal Combat phase effect trigger but no additionnal combat phase happens

Which card did behave improperly ?
Additionnal Combat phase cards

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
OoAv1

What exactly should be the correct behavior/interaction ?
The Additionnal Combat phase effect trigger an additionnal combat phase

Are any other cards possibly affected by this bug ?
Finest Hour
Aurelia, the Warleader
Hellkite Charger
Godo, Bandit Warlord
Savage Beating

As of PTT :

Working
Relentless Assault
Aggravated Assault

Not working
Sokenzan (unleash do nothing)
Finest Hour (no additional combat phase and with Aggravated Assault will add another legacy exalted effect every additional phase)
World at War (do nothing, Rebound effect add World at War to hand before auto casting it)
Aurelia, the Warleader (no additional combat phase)
Savage Beating (no additional combat phase)
Hellkite Charger (do nothing and doesn't untap even when mana requirement for ability is paid)
Godo, Bandit Warlord (no additional combat phase)

This also affects Scourge of the Throne.

In current dev (81fdc45), Relentless Assault

• Immediately ends the current phase and begins a combat phase, instead of waiting until the phase ends. This is especially problematic if something lets you cast it at instant speed, either in response to something (which will resolve during the declare attackers step) or not during a main phase (in which case it should do nothing except untap creatures, see rulings); or if it's cast during the first main phase (you don't get a second combat phase or third main phase).
• Doesn't clear previous blocking assignments when it's cast during your turn after combat.
• Doesn't do anything when it's cast during the AI's turn after combat.
• Allows spells and abilities like Berserk that can only be cast/activated before a combat step to be cast again, violating 506.6d.
• "Attacks each turn if able" effects like Juggernaut's are treated like as "attacks each combat if able" like Frontline Rebel's. See rulings.
  • Most - I think all - continuous effects worded "CARDNAME attacks each turn if able" have by now received errata to become "[CARDNAME] attacks each combat if able", and the rulings I initially linked to have been quietly disappeared. There's still plenty of one-shot effects still worded "[some creature] attacks this turn if able," though. Nettling Imp and Heckling Fiends are typical. I haven't tested any of them.
• And essentially everything that looks for "attacked this combat" or "blocked this combat" misinterprets "attacked this turn" or "blocked this turn" as qualifying.

I haven't checked any of the other extra-combat-phase effects.