Mono-Fire rush

A Mono-Fire rush deck consists of mostly low-cost fire creatures with an emphasis on speed.

Fire is the archetypal civilization for rush. The only reason to use mono-fire is to use this deck; specifically, the use of Zyler's Lighter.

Mono-Fire Valborg
Another, similar type of mono-Fire rush uses various 2-cost Humans and Divine Machine Armor Valborg, a cost 3 double breaker.

In the current meta, mono-Fire Valborg would likely do poorly; this is partly due to the influence of DMD-01 Start Dash Deck: Fire & Nature, which introduced and reprinted several powerful cards for Fire and Nature rush. Valborg can still be used by integrating it into such a deck, which has plenty of powerful 2-cost Fire/Nature Humans like Gonta, the Warrior Savage and Taiga, the Warrior Savage.