You can always make a scoreboard team called 'lobby', then add everyone to it, put friendlyfire off. Then when the game starts empty the team.
This fixes both damage and knockback.
Very Impractical solution - /gamerule randomtickspeed (value). It will increase random ticks, which will grow saplings really fast at high values. However this causes lag, so maybe throw it on for 3 seconds at a moderate value, and then it will grow your tree, switch it off.
More practical solution - /clone a tree you have somewhere to a location.
I've had this multiple times in my games, so what I usually end up doing is creating a 'player' scoreboard value, and assign one to each player, and then just have sets of command blocks. Seems difficult for a server though.
This has been a problem in minecraft command blocks for a long time. Thats why I refrain from multiplayer vanilla commands, since it gets complicated.
I would recommend naming the entities different names, I just get confused, not that I think it makes a difference.
You are teleporting the Cow ten blocks up, you never teleported it TO the zombie, so its just going to teleport it ten blocks up. So you have to first teleport it to the zombie, then 10 blocks up
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This fixes both damage and knockback.
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More practical solution - /clone a tree you have somewhere to a location.
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This has been a problem in minecraft command blocks for a long time. Thats why I refrain from multiplayer vanilla commands, since it gets complicated.
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LOL xD jk
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Version of minecraft?
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No, if you have say, 2 blocks you'd want to test to destroy, and then want to check in a 5x5x5 radius around you, that would be...
2(types of blocks)x5(x direction)x5(y direction)x5(z direction)x2(command blocks it "comparators" to)
2*2*5*5*5
Thats 500 command blocks right there.
Last time I checked few(a small number of.) does not equal 500.
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Another way, is you can do /execute @a ~ ~ ~ detect ~ ~-1 ~ minecraft:air 0 /effect @p 8 1 255
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/clear @a [item]
so for example clear @a dirt or clear @a stone or clear @a diamond.
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You are teleporting the Cow ten blocks up, you never teleported it TO the zombie, so its just going to teleport it ten blocks up. So you have to first teleport it to the zombie, then 10 blocks up