Help with wording
                    How would you word a mechanic that prevents a creature from attacking/tapping on your next turn? Thanks in advance.                
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Comments
Wording created with the abilities haste and detain.
I hope this works/helps!
And as shadow created that wording with detain, I'll also link the MTG Wiki for detain, which sounds very similar to your mechanic idea in general.
https://mtg.fandom.com/wiki/Detain
Look at it like this...
[COST], detain [TARGET(s)]
{t}: Detain target creature an opponent controls. (Until your next turn, that creature can't attack or block and it's activated abilities can't be activated.)
CARDNAME 2G
Creature
Slow (~ can’t attack or tap on your next turn after you cast it.)
4/4
CARDNAME 2G
Slow (-- can't attack or tap the turn after it enters the battlefield.)