Five-Headed Dragon has absolutely no protection against Spell Cards. They affect him the same as any other monster.
Horus the Black Flame Dragon LV6 will not be affected by the effect of Lightning Vortex or Gravekeeper's Servant.
Dragon Master Knight doesn't have any direct support cards but can be supported with dragon and fusion support cards. Dragon's Mirror is a good example since it's a spell for dragon-type fusions. It should be noted that Dragon Master Knight cannot be special summoned unless the summon is treated like a fusion summon as stated in Dragon's Mirror's card text. However, when on the field it can be affected by cards that affect dragon and/or fusion type monsters.
Yes.
Yes. His 'unaffected by spell cards' effect is continuous and only applied while he is face-up on the field. So while he is in hand, he can be affected by cards such as Exchange, and Flute of Summoning Dragon.
Any five Dragon-type monsters can be used to fusion summon this monster in conjunction with the Spell card "Polymerization" or other fusion Spell cards (like "Future Fusion" and "Dragon's Mirror").
Yes. Monsters that are acting as Equip cards, are considered to be Equip Spell Cards and are affected by everything that normally affects Spell Cards. So spell destruction cards will affect them while monster destruction will not.
Yes, but Equip cards cannot equip Spell Cards. The Z-Metal Tank will have lost its target due to the Y-Dragon Head becoming an Equip Spell card too. The end result is the Z-Metal Tank will be destroyed.
yes star dust dragon can use its effect anytime in the game unless you have used one of your spell or trap cards or effectd
I run a very good dragon deck and the only equip card I run is Axe of Despair. 1000 attack.
There is currently no game-legal print of Slifer the Sky Dragon. Obelisk has a TCG and OCG print, Ra has an OCG print, so there will eventually be a legal Slifer.
Spell cards and Magic cards are the same. The reason for the confusion is because Magic cards were changed to Spell cards during the release of Magician's Force.
Of course. Only Exodia is unbeatable. In fact, if you have watched the show you should know that Yugi, Ishizu and Joey defeated Slifer, Obelisk and the Winged Dragon of Ra. In the real game there are many ways to defeat them. They ARE powerful but not invincible. Obelisk is only affected by spell cards since traps don' t work with him.