Hardcore realm tutorial minecraft | easy and quick java 1.16-1.17 | 1 block command

This video is outdated here is the command for 1.18+ it also lets you customize lives:
https://www.youtube.com/watch?v=1noTh5clgLE


hope you found this tutorial useful here are a list of commands:

main command:
/summon falling_block ~ ~5 ~ {BlockState:{Name:"minecraft:command_block"},TileEntityData:{Command:"scoreboard objectives add death deathCount"},Time:1,Passengers:[{id:"minecraft:area_effect_cloud",Duration:10,Passengers:[{id:"minecraft:falling_block",BlockState:{Name:"minecraft:redstone_block"},Time:1,Passengers:[{id:"minecraft:area_effect_cloud",Duration:10,Passengers:[{id:"minecraft:falling_block",BlockState:{Name:"minecraft:command_block"},TileEntityData:{Command:'/setblock ~ 1 ~ repeating_command_block{Command:"gamemode spectator @a[scores={death=1..}]"} replace'},Time:1,Passengers:[{id:"minecraft:area_effect_cloud",Duration:10,Passengers:[{id:"minecraft:falling_block",BlockState:{Name:"minecraft:command_block"},TileEntityData:{Command:"forceload add ~ ~"},Time:1,Passengers:[{id:"minecraft:area_effect_cloud",Duration:10,Passengers:[{id:"minecraft:falling_block",BlockState:{Name:"minecraft:redstone_block"},Time:1,Passengers:[{id:"minecraft:area_effect_cloud",Duration:10,Passengers:[{id:"minecraft:falling_block",BlockState:{Name:"minecraft:command_block"},TileEntityData:{Command:"setblock ~ 0 ~ minecraft:redstone_block"},Time:1,Passengers:[{id:"minecraft:area_effect_cloud",Duration:10,Passengers:[{id:"minecraft:falling_block",BlockState:{Name:"minecraft:command_block"},TileEntityData:{Command:"fill ~ ~1 ~ ~ ~-7 ~ air"},Time:1,Passengers:[{id:"minecraft:area_effect_cloud",Duration:10,Passengers:[{id:"minecraft:falling_block",BlockState:{Name:"minecraft:redstone_block"},Time:1}]}]}]}]}]}]}]}]}]}]}]}]}]}]}

gamemode creative:
/gamemode creative @p

gamemode survivial:
/gamemode survivial @p

reset deaths:
/scorboard players @p reset death

give command block:
/give @p command_block