command

・前提
/scoreboard objectives add ability totalKillCount
/scoreboard objectives add abilityTime dummy
/scoreboard objectives add abilityUse stat.useItem.minecraft.diamond_sword

/scoreboard players set @a ability 0

・回路
リピートコマブロを先頭に後ろは全てチェイン（動画の通り）
Unconditional＝(U),Conditional＝(C)と表記する

先頭から順番に
(U)/scoreboard players add @a[score_ability_min=0,score_ability=0] abilityTime 1
(U)/scoreboard players remove @a[score_ability_min=2,score_ability=2] abilityTime 1
(U)/scoreboard players set @a[score_abilityTime_min=900,score_abilityTime=900] ability 1
(U)/give @a[score_ability_min=1,score_ability=1] minecraft:diamond_sword 1 0 {display:{Name:"GravitySpikes",Lore:["地面に突き刺すことで重力波が発生し","敵を吹き飛ばす"]}}
(C)/scoreboard players set @a[score_ability_min=1,score_ability=1] abilityUse 0
(C)/scoreboard players set @a[score_ability_min=1,score_ability=1] abilityTime 200
(C)/effect @a[score_ability_min=1,score_ability=1] 11 10 5
(C)/effect @a[score_ability_min=1,score_ability=1] 8 10 10
(C)/scoreboard players set @a[score_ability_min=1,score_ability=1] ability 2
(U)/scoreboard players set @a[score_ability_min=2,score_abilityTime_min=-1,score_abilityTime=-1] abilityUse 1
(U)/execute @a[score_ability_min=2,score_abilityUse_min=1,score_abilityUse=1] ~ ~ ~ /execute @e[type=!Player,r=10] ~ ~ ~ /summon Creeper ~ ~ ~ {Fuse:0}
(U)/clear @a[score_ability_min=2,score_abilityUse_min=1,score_abilityUse=1] minecraft:diamond_sword 0 64 {display:{Name:"GravitySpikes"}}
(U)/scoreboard players set @a[score_ability_min=2,score_abilityUse_min=1,score_abilityUse=1] abilityTime 0
(U)/scoreboard players set @a[score_ability_min=2,score_abilityUse_min=1,score_abilityUse=1] ability 0