Trees, wisps, and now bugs.
Spell Druid is an Druid deck type introduced in Ashes of Outland. The deck uses mainly spells to maximize the value of 
Glowfly Swarm and Fungal Fortunes.
The deck runs mana ramping spells like Ramp Druid for 0-mana Bogbeam and Ironbark, utilizes token-summoning cards with board-wide effects as their main win condition like Token Druid, and combos Kael'thas Sunstrider with low-cost spells to cast big spells like 
The Forest's Aid and 
Gift of the Wild for huge swing turns.
In Wild, Spell Druid gains access to Jade cards like 
Jade Idol for late game to generate endless amount of growing Jade Golems with infinite card draw to prevent getting into fatigue, Jade Blossom for additional ramp , armor generating cards 
Ferocious Howl, Branching Path, 
Ultimate Infestation, and 
Oaken Summons for protection and additional protection from Spreading Plague and Malfurion the Pestilent, and more Token cards 
Wisps of the Old Gods, 
Landscaping and additional board removal such as Naturalize and 
Poison Seeds.
Once Spell Druid finishes casting their spells, Yogg-Saron, Hope's End is an additional win condition in the late game which can cast as many as 30 spells to close out the game or provide additional support against the enemy board.
Common cards[]
The following cards are usually in the deck.
Core cards[]
The following cards are played in most or all versions of the deck:
Optional cards[]
The following cards are played more than occasionally, but not always:
Wild cards[]
Wild cards that fit well into this deck type:
