Most of these cards will be based on R. A. Salvatore's books I have read. I'll make a few cards that should be made for competitive Yugioh play as well.

Here are 5 to start off (Dino based):

Emperor Tyranno

LV6/Earth/Dinosaur/Effect/2450/2150

This card cannot be Normal Summoned or Set. This can can only be Special Summoned by removing 2 Dinosaur Type monsters from your graveyard from play. Once per turn, destroy one card on the field. If this effect is activated, this monster may not attack.


Raptor

LV7/Earth/Dinosaur/Effect/2300/1400

When this can is Normal Summoned, you may Special Summon one "Raptor" from your deck to your side of the field. For every "Raptor" on your side of the field, increase the attack of this card by 500 points.


Lizard

LV3/Earth/Reptile/Effect/400/1000

If this card was used as Tribute for the effect of "Ultra-Evolution Pill", Special Summon this card in face-up ATK or DEF position during your next Standby Phase.


Anaconda

LV4/Earth/Reptile/Effect/2600/2000

If this card destroys a monster in battle, this card cannot attack for 3 of your opponent's turns.


Giant Croc

LV4/Water/Reptile/Effect/2000/100

When this card is Summoned, put a counter on this card. This counter decreases the attack of this card by 200 points. You may remove this counter to destroy one face-down card on the field. This monster may not attack in the same turn you activate this effect.


Dinosaurs are now playable!!!!!!!!!! :P