Yes, but increase wall and tower how exactly?
just some random suggestions:
1)Frost - basic gain 15, bonus gain 4, Freezing - gain wall for each Frost card in hand (C - 3, U - 6, R - 12) and tower (C - 1, U - 3, R - 9)
2)Frost - basic gain 10, bonus gain 5, Snowstorm - if matching non-Frost card is attack, tower- or wall- card of the same or lower rarity as played card replace it with common Frost card
, gain wall based on the total cost of the played car (Max N, N based on rarity of the played card (C - 9, U - 18, R - 36))
3)if Frost card is played after playing different non-common Frost card, upgrade rarities of neighbouring Frost cards
4)if played card is a neighbour card of Frost: raise wall (C - 2, U - 4, R - 10) and raise tower (C - 1, U - 2, R - 5)