ITT: We take two cards and make them into one card.

[Bringerofcake]

Something like this:

Two-Pronged Cyclone

Normal Spell

Target 1 Spell/Trap Card you control and 2 Spell/Trap cards your opponent controls: Banish your target and destroy both of your opponent's target.

 

Two Pronged Attack and Double Cyclone.

 

Post dem card fusions.

[Master Hyperion]

Double-Edged Six Samurai Master
DARK
Level 4
[Warrior/Effect]
If your opponent controls a monster and you control no monsters, you can Special Summon this card (from your hand). Once per turn: You can send 1 "Six Samurai" monster card from your hand to the Graveyard, then target 1 Level 4 or lower "Six Samurai" monster in either player's Graveyard; Special Summon that target. This card must remain face-up on the field to activate and to resolve this effect. During the End Phase of the turn you activate his card's effect, destroy the Special Summoned monster, and if you do, take damage equal to those destroyed monster's ATK.
ATK/ 400 DEF/0

Zombie Master + Elder of the Six Samurai + Double Edged Sword Technique

[Judαs]

Heavy Hole

[Spell Card]

Destroy all cards on the field.

 

 

you saw this coming.

[Phantom Roxas]

Moving this to Games, but I might as well post something.

Destiny Destruction
Normal Spell
Each player discards their entire hand, then draws the same number of cards they discarded. Destroy all cards on the field.

Final Destiny + Card Destruction

[Bringerofcake]

The Silent Grave

Normal Trap

When your opponent declares an attack; negate that attack. Then destroy all Special Summoned monsters your opponent controls.

 

Dark Spirit of the Silent + Call of the Grave.

[~British Soul~]

Graceful Greed

Spell

Draw 5 cards then discard 2 cards.

[SpectralMaliceX]

Starforce Dragon
Level 9
Wind
Dragon/trap
When your opponent declares an attack you can tribute this card destroy all face up monsters that your opponent controls.

Mirror force + stardust dragon

[宇佐見 蓮子@C94]

Brionac the Guardian

WATER

Dragon/Level 7/3000 ATK/2300 DEF

When this card destroys a monster by battle: Discard 1 card, Special Summon that monster to your side of the field in attack position and return 1 card your opponent controls to the owner's hand.

 

Brionac + Goyo 

[SpectralMaliceX]

Name: Phantom blaster overlord - envoy of tragic endings
Level: 8
Atk/def: 3500/2500
type: warrior
attribute: dark
effect: this card can only be special summoned by banishing 3 cards from play, tribute 2 cards and this card can attack 3 times this turn. If this card attacks a defence position monster deal piercing damage.

Phantom blaster overlord + black luster soldier + dragon queen of tragic endings

[Kyng's Old Account]

http://www.youtube.com/watch?v=MS7LcODPKAw

Perfect Dark Gaia
EARTH
Fiend / Level 10/ 0 ATK/ 0 DEF
Must be Special Summoned with "Dark Fusion" and cannot be Special Summoned by other ways. The original ATK of this card is equal to the combined original ATK of the Fusion Material Monsters used to Fusion Summon it. When this card declares an attack: You can change all Defense Position monsters your opponent controls to face-up Attack Position. (Flip Effects are not activated at this time.) During either player's turn, when your opponent activates a Spell Card, Trap Card, or monster effect: You can send 1 Fiend or Rock-Type monster from your hand to the Graveyard; negate the activation, and if you do, destroy it.

Evil HERO Dark Gaia + Herald of Perfection

[宇佐見 蓮子@C94]

Cyber-Scientist

DARK/Effect/Level 1/0 ATK/0 DEF

You can pay 3000 life points; Special Summon 1 level 8 or lower Monster from your Extra deck and inflict damage to your opponent equal to 200 X the monster's level. 

 

Cyber-Stein + Magical Scientist + That turtle OTK thing whose name I forgot

[Reinforce]

Perfect Kristya

This card can only be Special Summoned by banishing from your hand, field of graveyard "Archlord Kristya" and "Herald of Perfection". When this card is summoned, you can choose one Fairy-Type monster in your graveyard, add it to your hand. While this card remains face-up on the field, neither player can special summon. When your opponent activates a Spell, Trap or Effect Monster's Effect, you can discard one Fairy-Type monster from your hand: negate it's activation and if you do, destroy it.

 

Archlord Kristya + Herald of Perfection.