Yes, you can use the effect of The Light - Hex-Sealed Fusion to Special Summon either Cyber-fusion monster. Obviously you need to have Hex and one or more Cyber Dragons on the field to use its effect. However, you cannot use Hex to Fusion Summon (using Polymerzation, Future Fusion, etc.) any of the Cyber-fusion monsters because their text states a Fusion Summon of the monster must be conducted with the correct monsters.
cursed magician
Red-eyes black dragon is not a fusion card. there is no other card, that i know of, that can fuse with blackland fire dragon to make a fusion card. red-eyes black dragon is a normal monster.
As long as you have he two cards for the fusion you have to play someone with that monster and kill it. Graveyard slot now does notmatter go back to your deck construction and reincarnate the tougher of the two or three fusion cards. This will get you the fusion card you are looking for
No, he is a Fiend/Fusion/Effect
Yes, but you have to have the fusion elements.
The highest original (printed) ATK of any YuGiOh! Card is 5000 ATK. This can be found on 5 different cards - 3 Dragon-type monsters and 2 Machine-type monsters: 1) Dragon Master Knight (Dragon/Fusion/Effect - 5000 ATK/DEF) 2) Malefic Truth Dragon (Dragon/Effect - 5000 ATK/DEF) 3) Five-Headed Dragon (Dragon/Fusion/Effect - 5000 ATK/DEF) 4) Rocket Arrow Express (Machine/Effect - 5000 ATK/0 DEF) 5) Superdimensional Robot Galaxy Destroyer (Machine/Xyz/Effect - 5000 ATK/2000 DEF) Notably there has never been a 5000 ATK Synchro Monster, and also notable is that the Dragon-type 5000 ATK monsters have greater DEF than the Machine-types.
Cyberdark Dragon cannot be summoned except by Fusion Summon. Cyber Stein does not 'fusion summon' the fusion monsters is summons, it is only a special summon. It therefore cannot summon monsters like Dark Paladin, or Cyberdark Dragon.
If you are talking about its effect to Special Summon a Fusion Monster with his effect, you can't. You have to have both The Light - Hex Sealed Fusion along with another Fusion Material, for example Cyber Dragon to Summon Cyber Twin Dragon, and Tribute both of them, and Special Summon Cyber Twin Dragon. His effect can be used to Tribute itself, including Cyber Twin, even if Cyber Twin says it can only use the above Fusion Materials for its Fusion Summon, but The Light Hex Sealed can be used as a substitute, since it is being used for a Special Summon, but not a Fusion Summon. If you are talking about his substitute effect, I'm not sure how you even can use that effect without the use of Polymerization.
[Dragon/Fusion/Effect] The fusion Material Monster for this card are any 5 dragon-type monsters. This monster cannot be Special Summoned except by fusion summon. This card does not take any battle damage and cannot be destroyed by battle with an EARTH, WATER, FIRE, WIND, or DARK monster.(Battle damage is still inflicted to players.)
no but there is a Five Headed Dragon[Dragon/Fusion/Effect] ATK/5000 DEF/5000
no, dragon master knight can only be fusion summoned.
A Fusion monster's level is almost entirely irrelevant. The Fusion monster will say what its components are, so for BEUD, it is 3x Blue-Eyes White Dragon. So that means if you have 3 Blue-Eyes White Dragon in any combination of hand or field, as well as a fusion card like Polymerization, then you can fusion summon the BEUD. Fusion monsters may have special summon text is their summoning method is different from above, like the Gladiator Beast fusions or Elemental HERO Neos fusions that do not use Polymerization.