Boros Lockdown (Modern)

Your goal is to cast the bridge and get rid of your hand besides one card in order to enable to attack with your tokens.

Playset of Leylines is important (at least to me). As you really often play against Thoughtseize, Burn Decks or just any silly other stuff. It's just so helpful to have one less card on your hand for your bridge to be useful.

Pentad Prism gives you a ramp of 5 Mana in turn 3. So feel free to cast Elspeth covering herself and you. I once played one more copy of Ajani and Elspeth instead of Assemble the Legion but it turned out to be too defensive, which showed off by milling myself.
Mind Stone for the same ramp purpose and enabling you a card draw at late game.

Just kill everything until Leyline and Bridge are on the battlefield. And it's always better to have more than 1 copy lying around!
I tried ghostly prison, but it was only useful against non-green, speed decks, which don't attempt to be my enemy very often. But for this special case I put it into my SB.

Flooded Strand just for price reasons, as Arid Mesa just rips off your wallet and 6 fetchies have to be enough with no lifelink in deck!