Base of the Mountain with allies

[twin tusk]

If I block with base of the Mountain and banish chum to its ability how much is the total block value? 1 or 7

[willow solar]

1

Chum's health isn't assigned as block value

[sturdy iris]

chum lacks a value so doesn't contribute anything other than increasing base's

[obtuse flame]

It's not directly related to the question but the ally, having 6+ power, will trigger phantasm. My bad sorry, I have been lurked into that by my opponent 😬 .

[wild marsh]

Phantasm requires an attack action card to trigger.