I think the intention of the card is that while a creature is attacking, it gets +1/+0, but that it would lose that bonus when the creature is no longer attacking. However, since the wording lacks the crucial "until end of turn" phrase, it could be construed that the +1/+0 bonus never ends and is accumulative (meaning that the first time a creature attacks, it gets +1/+0; the second time it attacks it gets +2/+0 (+1 from the previous turn, +1 from this turn); the third time it attacks it gets +3/+0; etc).
So, which is correct? I expected there to be a ruling on the Oracle text, but there doesn't appear to be one. Is the bonus only applied short-term during the attack, or does the bonus stack turn after turn?
To answer your question, the (each) attacking creature only gets +1/+0. Gruul War Chant states "Each attacking creature you control gets +1/+0 and can't be blocked except by two or more creatures.". Once you have moved to your second main phase the creature(s) is/are no longer longer attacking so the pump has ended.
as others have said, it loses the +1/+0 after combat is over. the only way it would keep the boost is if the card says counters, then it stays until the creature dies.
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I think the intention of the card is that while a creature is attacking, it gets +1/+0, but that it would lose that bonus when the creature is no longer attacking. However, since the wording lacks the crucial "until end of turn" phrase, it could be construed that the +1/+0 bonus never ends and is accumulative (meaning that the first time a creature attacks, it gets +1/+0; the second time it attacks it gets +2/+0 (+1 from the previous turn, +1 from this turn); the third time it attacks it gets +3/+0; etc).
So, which is correct? I expected there to be a ruling on the Oracle text, but there doesn't appear to be one. Is the bonus only applied short-term during the attack, or does the bonus stack turn after turn?
That's where you can ask rules questions in the future.
As for your question it's just a straight +1/+0.
To answer your question, the (each) attacking creature only gets +1/+0. Gruul War Chant states "Each attacking creature you control gets +1/+0 and can't be blocked except by two or more creatures.". Once you have moved to your second main phase the creature(s) is/are no longer longer attacking so the pump has ended.
Vi Veri Veniversum Vivus Vici.