I just recently made a Troll Deck and it usually win with 500+ or 1000+ DP so I'm gonna show you how to make a Troll Deck in Duel Academy.

Monsters

Name            #of cards
Sangan                   1
Kuriboh                   1
Mask of Darkness 2
Big Eye                   1
Magician of Faith  2
Man Eater Bug      1
Hane Hane            1
Needle Worm        3
Morphing Jar         1
Blast Sphere          1
Cyber Jar                1
Nimble Minonga    2
Morphing Jar 2      1
Yomi Ship               1
Hade Hane             1

! year use
 Fiber Jar                 1(2nd year only)
Witch of the Black Forest 1(2nd year only)

Spells

Lightning Vortex    1
Scapegoat              1
Card Destruction   1
Mystical Space Typhoon 1
Nobleman of Crossout     1
Nobleman of Extermination 1
Spring of Rebirth    1
Book of Taiyou       1
Book of Moon         1
Final Countdown   1

Traps

Spellbinding Circle 1
Widespread Ruin    1
Woboku                     1
Mirror Force              1
Enchanted Javelin   1
Magic Cylinder          1
Solemn Wishes        1
Gravity BInd             2(1 in 2nd year)
Nightmare Wheel    1
Sakaretsu Armor     1
Compulsory Evacuation Device 2
 Draining Shield      2

1 year use 
Raigeki 1  ( only in 2nd year)

The goal is to keep defending until your opponent's Deck runs out using Needle Worm,Card Destruction and Morphing Jar and mostly defending with Gravity Bind.

 Optional cards

Cure Mermaid 1
Gora Turtle      1

Local Mods : I don't think this should be called a guide. Guides are meant to be helpful, and true, you can win easily with this, but it's such a low strategy that it's helpfulness is more than debatable. Your word prevails here, so it's your call.