Here’s a list of the new cards that were added in the Events System update. You can unlock Jolly Holly via the Feastivus Bundle. Also, you can now craft cards from the Halloween event which were Jack O' LanternStrikethrough When this hurts the Zombie Hero, it gets +1 Strength. and Trick or TreaterWhen you play your first Trick each turn, Conjure a Treat. for 1,000 Sparks each.
All of these cards are now in the PvZ Heroes: Deck Builder! Go and make some sweet decks.
View more cards after the jump!