Curse of the Werefox / Slumbering Keepguard
Is there a bug with Curse of the Werefox or Slumbering Keepguard? I tried to cast Curse, to have my Keepguard fight an opponent's creature, and I planned to activate Keepguard's ability at instant speed in response to Werefox's triggered ability. I had at least 3 open mana including a white. But when I tried, it wasn't possible to activate Keepguard, even though there isn't an "only as a sorcery" clause. It seemed like Curse's triggered ability just resolved right away without an opportunity to respond. It may be that I misunderstand the templating, but I think the reflexive triggered ability should have gone on the stack, giving me an opportunity to pump the Keepguard before the fight resolves. If I'm incorrect about this, please let me know! Otherwise I think there may have been a bug? I apologize I didn't get any images or video!
Thank you!
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[Deleted User] commented
To respond to your own spells and abilities (triggered abilities included), you have to go into Full Control mode before the spell or ability is put on the stack. Otherwise Arena just uses the tournament shortcut of passing priority to your opponent, and if there is no response from them, the top object gets to resolve. Full Control lets you keep priority to respond.