Heirloom Epic does properly hold priority
Heirloom Epic does not hold priority when you have 4 creatures untapped during your turn if one of those creatures entered the battlefield that turn. I was unable to see if i held priority if i was able to activate it.
3
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DeathDozer#02727
shared this idea
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HIT#08120 commented
I have foudn that this is also true. if a creature has summoning sickness, heirloom epic does not hold priority as if it can be used, even though it can.