Your issue here is that your values are not integers. Because enchantment level and id are both stored as shorts, you must add an 's' after them. Thus, the working command would be:
/testfor @p[r=5] {Inventory:[{tag:{ench:[{id:16s,lvl:1s}]}}]}
You have to use a command to apply a label to the player based on their data rather than using /testfor. For example, /scoreboard can assign a label:
/scoreboard players tag @a[tag=HasItem] remove HasItem
/scoreboard players tag @a[tag=!HasItem] add HasItem {SelectedItemSlot:0,Inventory:[{Slot:0b,tag:{display:{Name:"Fire Wand"}}}]}
And you'd then target players based on their label. The correct tag for fireball damage is ExplosionPower:
/execute @a[tag=HasItem] ~ ~ ~ /summon Fireball ~2 ~1 ~ {ExplosionPower:10,direction:[0.0,0.0,0.0]}
If using 1.8, you will have to use a score instead. Objective to create:
/scoreboard objectives add HasItem dummy
Commands to run for labeling:
/scoreboard players set @a HasItem 0
/scoreboard players set @a HasItem 1 {SelectedItem:{tag:{display:{Name:"Fire Wand"}}}}
And for targeting, you'd use the score parameter:
/execute @a[score_HasItem_min=1] ~ ~ ~ /summon Fireball ~2 ~1 ~ {ExplosionPower:10,direction:[0.0,0.0,0.0]}
You may be interested in the SelectedItem compound, which holds a copy of the player's currently-held item. This way you do not need to specifically test each individual hotbar slot:
/scoreboard players tag @a[tag=!HasItem] add HasItem {SelectedItem:{tag:{display:{Name:"Fire Wand"}}}}
Best Answer
Instead of using the
unbreakableattribute, use theenchattribute to add almost infinite unbreaking to the item. (It is still possible to break it, but it would have to deal the damage of killing about 130,000 ender dragons) The command is/give (Name) minecraft:(item) 1 0 {ench:[{id:34,lvl:10000}]}.The item now has unbreaking level 10,000.