Suppression ray allows you to stun creatures tapped with it
Suppression Ray states:
"Tap all creatures target player controls. You may pay X {E}, then choose up to X creatures tapped this way. Put a stun counter on each of them."
The official ruling states:
"Creatures tapped this way" means creatures that became tapped as a result of Suppression Ray's effect, not creatures that were already tapped before Suppression Ray began to resolve.
https://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=661799&printed=false
Arena allows you to place stun counters on any tapped creature
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YugoAmaryl#14369 commented
still bugged Even MH3 is over lol
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Bluefishy#32002 commented
Ray of suppression still bugged