Minecraft Java Edition – How to Give Player a Splash Potion of Healing II in Version 1.9.4

The Dropper block, available since Minecraft 1.5, can be used for this purpose. It is similar to a dispenser, except that it does not “activate” items like arrows and fireworks, so they will be dropped for the player to pick them up instead.

When you apply the effect to the player, set some scoreboard value to 1. Set it back to 0 when clearing the effect from the player. This way you can keep track of what effects the player might or might not have.

To create a scoreboard do scoreboard objectives create speed1 dummy. Then set the player's score to 1 using scoreboard players set <player> speed1 1. After that give all players with a score of 1 speed using effect @a[score_speed1_min=1] speed 1000000 <whatever value> true. When clearing the effect do the exact opposite, set the score back to 0 and clear the effects of all players with a score of 1.

You should have the command blocks applying and clearing the effects on a clock. If you set score speed2 for player1 to 0, while a player2 has speed1 set to 1, this will happen:

1. Speed (all levels) will get cleared from player1 and player2
2. Speed 1 will be given to player2

So: Before - Player1 has speed 2, player2 has speed 1. After - Player1 has no speed, player2 still has speed 1

Please excuse me for my possibly not very good English, I hope this helped you :)