Helm's ruling indicates that if it's equipped to a clone, then it will produce tokens of whatever creature that clone was copying. Evil Twin however also gives himself an additional ability. Does Helm copies that ability as well?
The activated ability acquired by Evil Twin is part of Evil Twin's copiable values (C.R. 706.9a), so that it can be copied by other copy effects, including that of Helm of the Host (C.R. 706.2). This is because the effect giving Evil Twin that ability has the form "enter the battlefield as a copy ... except it has ..." (C.R. 706.9, 108.1).
Helm's ruling indicates that if it's equipped to a clone, then it will produce tokens of whatever creature that clone was copying. Evil Twin however also gives himself an additional ability. Does Helm copies that ability as well?
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Shu Yun, the Silent Tempest WUR Voltron Control
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