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The Sword in the Stone. Quick tutorial how to make it and Retrieve the Sword.

Please not when placing the "Zombie" Sword you might need to fiddle around with the co-ords to get it right, Also not that you need to spawn the villager before a player gets closer to the sword then the villager.

The commands you will need :

The Sword (Zombie)
/summon Zombie ~-1.2 ~5 ~-0.5
{Invulnerable:1,Attributes:[{Name:generic.movementSpeed,Base:-100}],Equipment:[{id:276},{},{},{},{}],ActiveEffects:[{Id:14,Amplifier:2,Duration:99999999}],
PersistenceRequired:1,CustomName:Dinnerbone,}

Add the scoreboard :
/scoreboard objectives add sword dummy sword
/scoreboard players set @a sword 1

TellRaw
/tellraw @p {"text":"Try pull out the Sword? ", "extra": [{"text":" Yes", "clickEvent":{"action":"run_command", "value":"/scoreboard players set @p sword 2"}}]}

Testfor sword 2
/testfor @a[score_sword_min=2]

Firework
/summon FireworksRocketEntity 104 73 240 {LifeTime:0,FireworksItem:{id:401,Count­:1,tag:{Fireworks:{Explosions:[{Flicker:­1,Trail:0,Type:1,Colors:[0],FadeColo­rs:[0]}]}}}}

Removal of block:
/setblock 104 73 240 0 and /setblock 104 73 240 4

OR difficulty
/difficulty 0 and /difficulty 1

Give Command
/give @p 276