Deck abusing the FRF Dash mechanic,

Purphoros, God of the Forge and Outpost Siege can both be activated by ETB and LTB every turn when dashing.

Flamerush Rider has great synergy with Mardu Heart-Piercer .

Hammer of Purphoros to give haste to non-dashing creatures

Most non-dashing creatures can be pulled from the graveyard with Alesha, Who Smiles at Death.

Mardu Scout can easily give enough devotion so Purphoros is only a creature on your turn.