You need to Fusion Summon it by using 'Black Luster Soldier' and 'Blue-Eyes Ultimate Dragon'. You must use Fusion Summon, so cannot being it out using cards like 'Cyber Stein' or 'Summoner of Illusions'. However you can use Fusion Substitutes like 'King of the Swamp' in place of one of the components.
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It can indeed. Both have 5000 base ATK. Five-Headed Dragon cannot be destroyed by battle unless by a LIGHT monster, which Dragon Master Knight is. Normally both would be destroyed due to having the same ATK, but if there is another dragon on your side of the field, your Dragon Master Knight will be 5500 ATK and survive battle with Five-Headed Dragon.
The prices for this card vary per store. A good standard price for the Dragon Master Knight card is about $6.99 to $7.95.
A "Dragon Master Knight" Level 12. 5,000 atk. 5,000 def. Effect is that all dragon cards on the field give Dragon Master Knight +500 atk
Dragon Master Knight and F.G.D.
"Dragon Master Knight" is worth approximately $2.50-$9.00 USD, depending on condition and whether or not it is still in the sealed package it came in. The reason for why it is not worth a whole lot is because it is an easy-to-get promotional card. I hope this helped you out.