Unless specifically stated otherwise, a monster's summoning requirements are for when it is in your hand. Plaguespreader Zombie is an example of a monster that can be special summoned by its own effect while it is in a different zone (graveyard in this case). Red-Eyes Darkness Metal Dragon has no such text, so the listed special summoning method can only be used while it is in hand.
Red-eyes Darkness Metal Dragon cannot be played from your deck,but only from your hand
No, no card's effect can be activated while it is in deck.
Tohru Inada has: Played Alarm Mecha in "Dragon Ball GT" in 1996. Played Soldier A in "Dragon Ball GT" in 1996. Played Doctor in "Dragon Ball GT" in 1996. Played Man A in "Dragon Ball GT" in 1996. Played Hanma in "Dragon Ball GT" in 1996. Played Villager in "Dragon Ball GT" in 1996. Played Announce in "Dragon Ball GT" in 1996. Played Bizu in "Dragon Ball GT" in 1996. Played Anchan B in "Dragon Ball GT" in 1996. Played Devotee in "Dragon Ball GT" in 1996. Played Dinosaur in "Dragon Ball GT" in 1996. Played Arijigokumodoki in "Dragon Ball GT" in 1996. Played Ebich Lee in "Dragon Ball GT" in 1996. Played Luud in "Dragon Ball GT" in 1996.
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Kaiba never played 'Luster Dragon'/'Sapphire Dragon', he played 'Luster Dragon #2'/'Emerald Dragon' first in episode 121.
Nobuyoshi Nakamura has: Played Little Dragon in "Viva la Raza: The Legacy of Eddie Guerrero" in 2008. Played Dragon Kid in "ROH: Dragon Gate Challenge II" in 2008. Played Little Dragon in "WWE: The Rise and Fall of WCW" in 2009. Performed in "Enter the Dragon" in 2009. Played Dragon Kid in "Untouchable" in 2010. Played Dragon Kid in "Mercury Rising" in 2010. Played Dragon Kid in "DragonGate USA Uprising" in 2010. Played Dragon Kid in "United We Stand" in 2011.
Monika Antonelli has: Played Chiaotzu in "Dragon Ball" in 1986. Played Puar in "Dragon Ball" in 1986. Played Chaozu in "Dragon Ball Z" in 1989. Played Chiaotzu in "Dragon Ball Z" in 1989. Played Puar in "Dragon Ball Z" in 1989. Played Puar in "Dragon Ball GT" in 1996. Played herself in "Dragon Ball Z: Budokai 3 - Behind the Screams" in 2005.
Bob Note has: Played Zombie in "Nightmare of the Living Dead" in 1998. Played Kevin in "Hell Day" in 2003. Played Zombie in "Zombie Graveyard" in 2004. Played Teddy in "Evel Cat: The Return" in 2004. Played Soldier 2 in "The Graveyard of Death" in 2005.
Jeremy Quiles has: Played Latin Dragon in "CZW New Heights 2012" in 2012. Played Latin Dragon in "CZW Cerebral 2012" in 2012. Played Latin Dragon in "CZW Redemption" in 2012. Played Latin Dragon in "CZW Proving Grounds" in 2012. Played Latin Dragon in "CZW Ascension" in 2013. Played Latin Dragon in "CZW New Heights 2013" in 2013. Played Latin Dragon in "CZW 14" in 2013.
Tiffany Vollmer has: Played Bulma in "Dragon Ball" in 1986. Played Maron in "Dragon Ball Z" in 1989. Played Bulma in "Dragon Ball Z" in 1989. Played Betsy in "Meitantei Conan" in 1996. Played Bulma in "Dragon Ball GT" in 1996. Played Bulma in "Dragon Ball Z: Budokai" in 2002. Performed in "Invasion: Anime" in 2002. Played Bulma in "Dragon Ball Z: Budokai 2" in 2003. Played herself in "Dragon Ball Z: Budokai 3 - Behind the Screams" in 2005. Played Bulma in "Dragon Ball Z: Sagas" in 2005. Played Bulma in "Dragon Ball Z: Shin Budokai - Another Road" in 2007. Played Bulma in "Dragon Ball Z: Infinite World" in 2008. Played Bulma in "Dragon Ball DS" in 2008. Played Doctor in "Ciao" in 2008. Played Bulma in "Dragon Ball: Raging Blast" in 2009. Played Bulma in "DragonBall: Revenge of King Piccolo" in 2009.
Yoshihiro Asai has: Played Ultimo Dragon (1996-1999) in "World Wide Wrestling" in 1975. Played The Ultimo Dragon in "World Championship Wrestling" in 1985. Played Ultimo Dragon in "WWF Raw Is War" in 1993. Played The Ultimo Dragon in "WCW Monday Nitro" in 1995. Played The Ultimo Dragon in "WCW Hog Wild" in 1996. Played Ultimo Dragon in "Halloween Havoc" in 1997. Played Ultimo Dragon in "WCW Fall Brawl: War Games" in 1997. Played Ultimo Dragon in "The Great American Bash" in 1997. Played The Ultimo Dragon in "WCW Spring Stampede" in 1997. Played The Ultimo Dragon in "WCW World War 3" in 1997. Played The Ultimo Dragon in "WCW Uncensored" in 1997. Played Ultimo Dragon in "WCW Slamboree" in 1997. Played Ultimo Dragon in "Sunday Night Heat" in 1998. Played The Ultimo Dragon in "WCW Thunder" in 1998. Played Ultimo Dragon in "New Japan Pro-Wrestling 30th Anniversary 1997-1999" in 2002. Played Ultimo Dragon in "WWE Vengeance" in 2003. Played himself in "WrestleMania XX" in 2004. Played Ultimo Dragon in "WWE No Way Out" in 2004. Played Himself (2007) in "1PW Television" in 2006. Played Himself (2007) in "Consejo mundial de lucha libre" in 2007. Played Himself (2010) in "Nu Wrestling Evolution" in 2007. Played himself in "LuchaMania" in 2009. Played Ultimo Dragon in "WWE: The Rise and Fall of WCW" in 2009. Performed in "Bloodstained Memoirs" in 2009. Played Ultimo Dragon in "Breaking the Code: Behind the Walls of Chris Jericho" in 2010. Performed in "Inoki Bom-Ba-Ye 2010" in 2010. Played Ultimo Dragon in "WWE: The Best of WCW Clash of the Champions" in 2012.
Chris Forbis has: Played Dr. Flappe in "Dragon Ball" in 1986. Played Dr. Briefs in "Dragon Ball" in 1986. Played Sherman Priest in "Dragon Ball" in 1986. Played Dr. Brief in "Dragon Ball Z" in 1989. Played Dodoria in "Dragon Ball Z" in 1989. Played Farmer in "Dragon Ball Z" in 1989. Played Dr. Briefs in "Dragon Ball Z" in 1989. Played Francis in "Meitantei Conan" in 1996. Played Hyde in "Meitantei Conan" in 1996. Played Charles in "Meitantei Conan" in 1996. Played Additional Voices in "Buru Jenda" in 1999. Played Tubby in "Baki the Grappler" in 2001. Performed in "Baki the Grappler" in 2001. Played Dodoria in "Dragon Ball Z: Budokai" in 2002. Played Dr. Brief in "Dragon Ball Z: Budokai 2" in 2003. Played Dodoria in "Dragon Ball Z: Budokai 3" in 2004.