Help with spell selection

[Saxavarius]

I'm looking for a little help choosing spells for a druid that uses its animal companion as a mount and uses a lance (DM allows class proficiency swaps); the spells are for support and those moments when something has to die now.

I have a list already but looking for suggestions about any that are not needed or ones that should be there

(click to show/hide)

0-level
Light      Purify Food and Drink      Create Water       Read Magic Mending       Resistance
1-level
Produce Flame     Endure Elements       Longstrider        Shillelagh      Animate Wood    Entangle       Delay Disease       Instant of Power
2-level
Wood shape     Brambles     Barkskin     Bull’s Strength    Cat’s Grace     Updraft      lesser vigor  Halo of sand  Lave Missle    Briar Web    Creeping Cold      Decomposition
3-level
Call Lightning      Thornskin     Stone Shape     Daylight   Spikes    Speak With Plants     Thunderous Roar     Vigor    Mass lesser Vigor      Venomfire
4-level
Air walk(PHB 196)  Arc of Lightning       Freedom of Movement      Langour      Last Breath       Wall of Salt     Summon Elementite swarm       Vortex of Teeth    Lava Splash     Creeping Cold Greater
5-level
Call Lightning Storm    Control Winds      Animal Growth      Inferno     Rejuvenation Cocoon    Flesh to Salt  Greater Vigor  Dawnshroud
6-level
Mass bears endurance      Mass Bull’s Strength     Mass Cat’s Grace     Ironwood     Tortoise Shell      Fire Seeds                     Tidal Surge     Vigorous Circle      Anger of the Noonday Sun       Rusting Fog   
7-level
Animate Plants    Mass Flesh to Salt      Wind Walk    Fire Storm   Master Earth     Explosive Pinecone
8-level
Bombardment  Sunburst    Stormrage     Frostfell  Word of Recall
9-level
Storm of Vengeance      Summon Elemental Monolith       Regenerate       Nature’s Avatar   Transmute Rock to Lava     Tsunami     Cast in Stone

[Kethrian]

4th - Boreal Wind (CL 8 = 5 rounds of use)

8th - Deadfall (No evasion or mettle, reflex partial only prevents prone, not damage)