iMtG Server: Gathering

Mardu Rush 70 cards, 0 sideboard 8 {Mountain} 1 {Nomad Outpost} 1 {Bloodfell Caves} 6 {Swamp} 3 {Wind-Scarred Crag} 1 {Scoured Barrens} 10 {Plains} 30 lands 1 {Brimaz, King of Oreskos} 1 {Master of Cruelties} 1 {Herald of Anafenza} 1 {Wall of Limbs} 1 {Blood Baron of Vizkopa} 1 {Mardu Roughrider} 2 {Seeker of the Way} 1 {Ponyback Brigade} 1 {Watcher of the Roost} 2 {Chief of the Scale} 1 {High Sentinels of Arashin} 1 {Jeering Instigator} 1 {War-Name Aspirant} 1 {Mardu Heart-Piercer} 1 {Mardu Heart-Piercer} 1 {Mardu Hateblade} 1 {Chief of the Edge} 1 {Mardu Hordechief} 1 {Bellowing Saddlebrute} 1 {Fabled Hero} 1 {Mer-Ek Nightblade} 23 creatures 1 {Cast into Darkness} 1 {Kill Shot} 1 {Cutthroat Maneuver} 1 {Sunbond} 1 {Aspect of Gorgon} 1 {Rush of Battle} 1 {Brawler's Plate} 1 {Ajani's Presence} 1 {Wear // Tear} 1 {Sorin, Solemn Visitor} 1 {Circle of Flame} 1 {Heart-Piercer Bow} 1 {Feat of Resistance} 2 {Lightning Strike} 1 {Fleetfeather Sandals} 1 {Pharika's Cure} 17 other spells Sideboard

Relatively new to MTG and this is my first constructed deck using whatever cards I found in boosters. Any advice would be greatly appreciated!

Two things,

It's noticeable that you have lots of one or two ofs. It's better to get rid of those and play more of the cards that really work. I understand that you probably only have one or two of a lot of the cards you're using, but once you get multiples it'll make the deck more consistent.

{Ride Down} is the bomb. If you're playing against decks with creatures you'll want four of them.

Thanks!