Dark arm deck

Hi, this is my deck, could some kind soul tell me how I can improve my deck?

Monsters: 21
3 Dark arm dragon
1 snipe hunter
1 doomsday horror
2 D-hero Dasher
1 Card trooper
3 Necro gardner
3 Apprentice magician
2 Old vindictive magician
2 Obsidian dragon
1 spirit reaper
1 dark creator
1 Jinzo

Spells: 13
2 beggining of the end
2 Dark eruption
1 Tribute to the doomed
1 monster reborn
1 premature burial
1 lightning vortex
1 fissure
1 brain control
1 Mystical Space Typhoon
1 Nobleman of crossout
1 Heavy storm

Traps: 8
3 Sakuretsu armour
1 Raigeki break
2 dark illusion
1 torrential tribute
1 Crush card virus

Problems I encounter:
I find alot of problem playing against crystal beasts, could someone give me some pointers on how to improve?

can use d.d.crow

a bit werid de dark arm deck...