Mono-Red Burn Fury with Kessig Flamebreather for Standard

Kumano Faces Kakkazan transforms into a 3/3 creature with trample and can pump up other creatures when it becomes a creature. Monastery Swift Spear benefits from the additional damage output and haste, allowing for aggressive early attacks and potentially triggering Kumano's ability multiple times.

Kessig Flamebreather deals damage equal to the number of instant and sorcery spells you cast, while Shock is a cheap instant that can contribute to this count. Using Shock in conjunction with Kessig Flamebreather can quickly add up to significant damage in a spell-heavy deck.

Reckless Stormseeker provides a way to attack with haste and can give other creatures haste as well. Boltwave can hit multiple targets, allowing for a massive swing with Reckless Stormseeker, potentially overwhelming the opponent with a burst of damage.

Both Scorching Dragonfire and Lightning Strike serve as removal spells that can clear the board for your creatures. Using these spells in conjunction can help maintain board control while allowing aggressive creatures like Monastery Swift Spear to attack unimpeded.

Den of the Bugbear can be activated to create a 3/2 Goblin creature when you have spare mana from Mountains. This synergizes well with a deck focused on aggressive creature strategies, providing additional threats that can also benefit from the spells being cast.