Combo Druid (Also known as Malygos Druid, Togwaggle Druid, or Star Aligner Druid) is an combo-based Druid deck type.
The two versions of Combo Druid use different win conditions. 
Malygos Druid is a traditional combo deck that uses Malygos with cheap spells to deal lethal damage, often multiplying Malygos in the process as well. On the other hand, Togwaggle Druid relies on the opponent's win condition and fatigue damage. After drawing out most or all of their deck, they switch their depleted deck for their opponent's while also copying their hand while stalling out and let fatigue damage kill the opponent. In Wild, it uses 
Star Aligner and an 8-mana minion with 7 Health so Juicy Psychmelon can draw a majority of the combo pieces as well as cards that can reuse Star Aligner's Battlecry to burst down the opponent. The deck contains lots of card draw and uses Armor and AoE removal to stall.
These combos normally cost too much mana to achieve on their own but there are multiple ways to cheat out their costs. Dreampetal Florist is used to greatly discount one of their combo pieces, while Flobbidinous Floop lets you play a 4-mana Malygos the turn after. In Wild, 
Aviana followed by 
Kun the Forgotten King are used to refill your mana and turn your expensive minions into 1-cost minions. Less reliable supplementary options include 
Twig of the World Tree and 
Jungle Giants.
Rastakhan's Rumble introduced a new variant, Gonk Druid (also known as Shapeshift Druid). This uses multiple copies of 
Gonk, the Raptor to build up attacks by using your hero to kill several enemy minions, aiming to OTK the opponent with multiple direct attacks.
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:
Malygos Druid
Togwaggle Druid
Gonk Druid
Optional cards
The following cards are played more than occasionally, but not always:
Wild cards
Wild cards that fit well into this deck type:
