This deck is based on Celtic mythology and, as such, all the Major Arcana cards are named according to whichever mythic individual they portray, e.g. 'The Fool' becomes 'Lug', 'Death' becomes 'Art Mac Cond', and 'the Sun' becomes 'Bran Mac Febal'. Knowledge of the Celtic myths would be a great advantage in working with these cards.
The Minor cards retain their original names except for 'Cups' which are now called 'Chalices'. The suit of Wands is represented by mistletoe, whilst the suit of Pentacles is represented by an egg-shaped talisman - Anguinum - which has a wrinkled surface, believed to have been formed by snake secretions. The instruction booklet gives this information but then goes on to say it was used as an amulet in rituals, which is a bit confusing as the two are not the same thing. All the Minor cards depict scenes from Druid culture, and the whole deck has a comic/cartoon-y feel.
I find this deck to be amusing, especially as many of the Minor cards show people who look like they've had a bit too much to drink! I think I would need to know a lot more about Irish myths and legends to use it, but it is a great deck to use for writing 'prompts'.