Helpful OP sign ;)

en 1.8 /give Signs

Use command and find out. Also, to actually use, ( if you already didn't know ) , you gotta obtain a command block. And to do that, do the following in your chat:

/give @p minecraft:command_block

After you do that, just copy and paste the command into the command block. Enjoy :)

Also, this is a WIP. So if it crashes your game, or if it doesn't work, contact me and I'll fix it.

The command

Note: Minify the command to avoid issues :)

/give @p sign 1 0 {
    BlockEntityTag: {
        Text1: "{\"text\":\"Click me to kill all mobs\",\"color\":\"dark_red\",\"italic\":true,\"underlined\":true,\"clickEvent\":{\"action\":\"run_command\",\"value\":\"/kill @e[type=!Player]\"}}",
        Text2: "{\"text\":\"Click me to clear inventory\",\"color\":\"blue\",\"bold\":true,\"underlined\":true,\"clickEvent\":{\"action\":\"run_command\",\"value\":\"/clear @p\"}}",
        Text3: "{\"text\":\"Click me to get  an OP blade\",\"color\":\"light_purple\",\"strikethrough\":true,\"clickEvent\":{\"action\":\"run_command\",\"value\":\"/give @p diamond_sword 1 0 {display:{Name:\\"The Last Sword You'll Ever Need\\",Lore:[\\"Literally,the last sword you'll ever need\\",\\"H\\"]},AttributeModifiers:[{AttributeName:\\"generic.maxHealth\\",Name:\\"generic.maxHealth\\",Amount:20,Operation:2,UUIDMost:38257,UUIDLeast:242317},{AttributeName:\\"generic.followRange\\",Name:\\"generic.followRange\\",Amount:32,Operation:2,UUIDMost:69596,UUIDLeast:576970},{AttributeName:\\"generic.knockbackResistance\\",Name:\\"generic.knockbackResistance\\",Amount:0,Operation:2,UUIDMost:11860,UUIDLeast:607876},{AttributeName:\\"generic.movementSpeed\\",Name:\\"generic.movementSpeed\\",Amount:20,Operation:0,UUIDMost:4499,UUIDLeast:361490},{AttributeName:\\"generic.attackDamage\\",Name:\\"generic.attackDamage\\",Amount:1e+94,Operation:2,UUIDMost:37154,UUIDLeast:297305}],ench:[{id:0,lvl:1e+94},{id:1,lvl:1e+94},{id:2,lvl:1e+94},{id:3,lvl:1e+94},{id:4,lvl:1e+94},{id:5,lvl:1e+94},{id:6,lvl:1e+94},{id:7,lvl:1e+94},{id:8,lvl:1e+94},{id:16,lvl:1e+94},{id:17,lvl:1e+94},{id:18,lvl:1e+94},{id:19,lvl:1e+94},{id:20,lvl:1e+94},{id:21,lvl:1e+94},{id:32,lvl:1e+94},{id:33,lvl:1e+94},{id:34,lvl:1e+94},{id:35,lvl:1e+94},{id:48,lvl:1e+94},{id:49,lvl:1e+94},{id:50,lvl:1e+94},{id:51,lvl:1e+94},{id:61,lvl:1e+94},{id:62,lvl:1e+94}],Unbreakable:1}\"}}",
        Text4: "{\"text\":\"Click me to get OP potion\",\"color\":\"white\",\"bold\":true,\"strikethrough\":true,\"clickEvent\":{\"action\":\"run_command\",\"value\":\"/give @p potion 1 8195 {CustomPotionEffects:[{Id:1,Amplifier:1000,Duration:2e+101},{Id:3,Amplifier:1e+100,Duration:2e+101},{Id:5,Amplifier:1e+100,Duration:2e+101},{Id:6,Amplifier:1e+100,Duration:2e+101},{Id:8,Amplifier:8,Duration:2e+101},{Id:10,Amplifier:100,Duration:2e+101},{Id:11,Amplifier:1e+100,Duration:2e+101},{Id:12,Amplifier:1e+100,Duration:2e+101},{Id:13,Amplifier:1e+100,Duration:2e+101},{Id:14,Amplifier:1e+100,Duration:2e+101},{Id:16,Amplifier:1e+100,Duration:2e+101},{Id:21,Amplifier:1e+100,Duration:2e+101},{Id:22,Amplifier:1e+100,Duration:2e+101},{Id:23,Amplifier:1e+100,Duration:2e+101}],display:{Name:\\"OP_Lucky_Potion\\"}}\"}}"
    },
    display: {
        Name: "Custom Sign"
    }
}

Created: Sat, 19 Nov 2016 21:50:56, Updated: Mon, 20 Mar 2017 05:31:45, Views: 8