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No. Haste includes a note that the extra attack it grants is not cumulative with “similar effects”, and something which says it’s like haste is about as similar as it gets.
What if you us the extra move from mythic Haste and the extra attack from mythic Heroism?
Augmented (3rd): If you expend two uses of mythic power, the target can attempt one additional attack per round when taking a full attack action (as if using a haste spell). The target can use this additional attack ability a number of times equal to your tier.
There's the important part. In that moment you're taking the extra attack as if using haste, and so if you're already making an extra attack using haste, which has a rule that you cannot benefit from stacking it or similar effects, then the bonus attacks from mythic heroism can't be used at the same time.
Note however that haste lasts 1 round per level and heroism lasts 10 minutes per level. When your haste runs out you can use those mythic heroism extra attacks (so it's not pointless).
It's quite feasible to have your hours-long buff already on before combat begins, meaning in clutch moments where you don't want to cast you can have a pool of extra attacks.
What if you us the extra move from mythic Haste and the extra attack from mythic Heroism?
Yes. The extra attack from your mythic heroism is the only part of that spell which functions as mythic haste. They do not conflict. You should enjoy all of the other benefits of your speedy spell.
Augmented (3rd): If you expend two uses of mythic power, the target can attempt one additional attack per round when taking a full attack action (as if using a haste spell). The target can use this additional attack ability a number of times equal to your tier.There's the important part. In that moment you're taking the extra attack as if using haste, and so if you're already making an extra attack using haste, which has a rule that you cannot benefit from stacking it or similar effects, then the bonus attacks from mythic heroism can't be used at the same time.
Note however that haste lasts 1 round per level and heroism lasts 10 minutes per level. When your haste runs out you can use those mythic heroism extra attacks (so it's not pointless).
It's quite feasible to have your hours-long buff already on before combat begins, meaning in clutch moments where you don't want to cast you can have a pool of extra attacks.
Do keep in mind that the extra attack from Mythic Heroism can only be used a number of times equal to your mythic tier. (as highlighted in the despription)
What if you us the extra move from mythic Haste and the extra attack from mythic Heroism?Yes. The extra attack from your mythic heroism is the only part of that spell which functions as mythic haste. They do not conflict. You should enjoy all of the other benefits of your speedy spell.
And do keep in mind that the two can NOT be combined into a second full round action.