Please Rate/Fix My Deck?

Question

Monster Cards (21):

2x Rainbow Dragon

1x Hamon, Lord of Striking Thunder

1x Sapphire Pegasus

1x Marshmallon

1x Dark Lucius LV8 (to throw in a strong monster)

2x Emerald Tortoise

2x Amethyst Cat

2x Cobalt Eagle

3x Amber Mammoth

3x Topaz Tiger

3x Ruby Carbuncle

Spell Cards (13):

1x Crystal Release

2x Hand Destruction

2x Crystal Beacon

2x Crystal Promise

2x Crystal Abundance

2x Crystal Blessing

2x Ancient City - Rainbow Ruins

Trap Cards (6):

1x Crystal Counter

1x Last Resort

2x Crystal Pair

2x Crystal Raigeki

Total: 40 Cards

Answer 1

Monsters: 18

2 Rainbow Dragon

1 Hamon, Lord of Striking Thunder

3 Sapphire Pegasus

2 Amber Mammoth

2 Topaz Tiger

2 Cobalt Eagle

2 Amethyst Cat

2 Emerald Tortoise

2 Ruby Carbuncle

Spells: 16

3 Ancient City - Rainbow Ruins

3 Rare Value

2 Crystal Abundance

2 Crystal Beacon

2 Crystal Blessing

2 Crystal Promise

2 Lightning Vortex

Traps: 6

2 Crystal Raigeki

1 Crystal Counter

1 Crystal Pair

1 Rainbow Gravity

1 Torrential Tribute

Total: 40 cards

Answer 2

I would give this deck a 7/10 because crystal beast decks aren't so good

Answer 3

add some staples take out rainbow dragon add in 1 more hamon take out emerald tortoise and in Sapphire Pegasus take out dark lucius level 8 add in dark magician of chaos and take out 1 ruby carbuncle