Collectible Card Game Headquarters

Describe the Bug:
Phyrexian Battleflies stack legacy p/t pump activations.

Which card did behave improperly?
Phyrexian Battleflies

Which update are you using? (date, name)Which type? (duel, gauntlet, sealed deck)
Manalink 2016/08/27: Eldritch Moon v2, duel

What exactly should be the correct behavior/interaction?
Phyrexian Battleflies don't stack legacy p/t pump activations recalculate p/t in one.

Are any other cards possibly affected by this bug?
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Merged p/t effects in 23867f98.