Davion Swarm is one of the oldest archtypes in existence, it was the runner up at the first Worlds tournament, and continuing to place well for the entirety of Battletechs existence. The deck relies on cheap, efficient mechs in order to quickly overpower the opponent.
Modern versions make use of Davions big 4 Pilots, and cheat them into play for free with Solaris Contacts. All 4 of the pilots give a bonus to your Swarm, giving you a big boost in damage to overpower their board. The deck can only needs 4 resources to function, and can turn any spare resources into fuel for their Black Market Connections to start cycling their Pilots or lost mechs.