get a repeating command block and type /summon ender_crystal and wait a few seconds and you get this 😈 (if you hit it you will go to height 44k and above lol) :
My Favorite Command Block Commands : 6 Steps - Instructables
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minecraftcommands - Twitter Search / Twitter
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Command Block – Minecraft Wiki
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New Command Blocks for 1.9 (Impulse, Repeating, Chain) - Commands, Command Blocks and Functions - Redstone Discussion and Mechanisms - Minecraft: Java Edition - Minecraft Forum - Minecraft Forum
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When you try repeating command blocks. : Minecraft, Action-adventure Game, Gaming : r/Minecraft
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MCPE-64309] Chain command blocks are broken - Jira
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Command Block – Minecraft Wiki
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