Jund aggro list : Need tips

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Hi. For tournament, I created this deck. I need it for saturday. Please, give tips to make it better.
That's the list.









Deck Name
Lands:Creatures:Spells:
21x Land11x Creature28x Spell 
2x Rootbound Crag
2x Overgrown Tomb
2x Blood Crypt
3x Stomping Ground
3x Verdant Catacombs
1x Forest
1x Mountain
1x Swamp
1x Reflecting Pool
1x Arid Mesa
1x Misty Rainforest
3x Dragonskull Summit
4x Dark Confidant
4x BloodBraid Elf
3x Tarmogoyf

Sb :
4x Vexing Susher











4x Lightning
1x Violent Ultimatum
3x Sarkhan Vol
4x Terminate
4x Maelstrom Pulse
3x Blightning
4x Putrefy
2x Umezawa's Jitte
3x Damnation

Sb :
4x Leyline of the Void
4x Pithing Needle
3x Damping matrix