I've got a few! n_n
Green-Eyes White Dragon
FUSION: Blue-Eyes White Dragon + Dragon Sorceror
EFFECT: During your Main Phase, you may return this card to your fusion deck to summon 'White Magician' from your Fusion Deck. (This can only be used once per turn). In addition, when a Trap Card is activated, you may negate and destroy that trap card.
ATK 3200/DEF 2600
FUSION: Dragon Sorceror + Dark Magician
EFFECT: During your Main Phase, you may return this card to your fusion deck to summon 'Green-Eyes White Dragon' from your Fusion Deck. (This can only be used once per turn). In addition, when a Spell Card is activated, you may negate and destroy that spell card.
ATK 3200/DEF 2600
EFFECT: Once per turn, during your standby phase, you may place or remove one Spell Counter on this card (max. 1). If this card has 1 Spell Counter on it, treat this card as a Dragon sub-type. If this card is a Dragon sub-type, increase it's ATK by 400, decrease it's DEF by 400.
ATK 2000/DEF 1600
Legendary Dragon Hakuryu
FUSION: Green-Eyes White Dragon + White Magician
EFFECT: You use "Ancient Prophecy", not "Polymerization", to Special Summon this card from your Fusion Deck. At the End Phase of the turn this monster was involved in Battle, remove this card from play, return the above monsters to your Fusion Deck and Special Summon "Dragon Sorceror" from your hand, deck or Graveyard.
ATK 5000/DEF 5000
You may use this card to Special Summon a Fusion Monster with 10 or more Level Stars to your side of the field by tributing the correct Fusion-Material Monsters. You may pay 500 Life Points to make the ATK of that card equal to the combined ATK of the Fusion-Material Monsters used to summon it until your next Standby Phase.
What do you think? I kinda need to work on names huh?
EDIT: Just for a little fun, I done 2 fun-cards based on Shaman King.
As a shaman, he can merge with spirits and work together with them to reach a goal.
ATK 1300/DEF 800
Effect (Union) Monster
Once per turn, during your Main Phase, if you control this monster on the field, you can equip it to your "Yoh Asakura" as an Equip Spell Card, OR change it back to a monster in face-up Attack Position. When equipped to a monster by this card's effect, that monster's ATK/DEF is increased by 2000. (1 monster can only be equipped with 1 Union Monster at a time. If the monster this card is equipped to is destroyed in battle, this card is destroyed instead.)
ATK 2700/DEF 2400