Here are some ideas I thought of for this game. Nice Game!!
1. Imp Pear (plant)
cost: 3 maybe 2
single use: turn a non-elite zombie into an imp
2. Spore Shroom (plant)
cost 1
when played: do 4 damage and gain a Dry-Up 1 cost spore shroom
3. Spikeweed (potted)
start of each turn do 3 damage to each zombie
4. dandy lion (plant)
Dry-Up when played: attack for half their health
5. Healer Zombie (zombie)
can heal 10 as a play
6. Moonflower (plant)
0 cost
when played gain Shadow effect
7. Murkidamia Nut
cost: 2
gain 5 defense
Shadow: do 5 damage
8. Dusk Lobber
cost: 2
do 6 damage
Shadow: do 6 to all zombies
9. Shadow Shroom
cost: 2
apply Poison 2
Shadow: apply Poison 2 to all zombies
10. Dragon Imp
immune to fire
can apply Burn 4 as an attack
Shadow: adds buffs to other cards while active
Poison: deals damage for the rest of the game