Along with the Eeveelutions, Terrastal Festival ex has plenty of other Secret Rares, including special art forms for Bloodmoon Ursaluna ex and Gholdengo
However, with limited numbers of essential cards like 004-018-mirabel-madrigal-gift-of-the-family and 004-013-julieta-madrigal-excellent-cook, the deck really isnt a strong choice in terms of overall power
Component one: Spiders Matter This is probably the most obvious direction to go in
Instead, try Wall of Denial from Alara Reborn
Then, unfortunately it gets reach over an evasive ability, so this is probably better on the defense which is also probably why becoming a creature doesnt tap it
Still, if you're building a casual pirate deck with black mana, we consider it a must-have