I was playing MTG arena, and my opponent completed the dungeon of the mad mage during my turn. The player was able to play the free card and I was not given priority to use one of my creatures activated abilities in response, subsequently losing the game (pretty epic game, to be honest). Is there a reason a player couldn't respond to a card being cast for free due to a dungeon ability?
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-MadMage
In this scenario, when a spell or ability has your opponent "venture into the dungeon" and your opponent's venture marker reaches the bottommost room, that room's room ability triggers then goes on the stack, then the active player gets priority to activate abilities (C.R. 608.3, 117.3b, 117.5, 117.1b, 309.4c. 309.5).
However, note the following:
No player has priority while a spell or ability is resolving (including between the time the room ability reveals the drawn cards and the time it lets one of them be cast) (C.R. 117.2e).
I was playing MTG arena, and my opponent completed the dungeon of the mad mage during my turn. The player was able to play the free card and I was not given priority to use one of my creatures activated abilities in response, subsequently losing the game (pretty epic game, to be honest). Is there a reason a player couldn't respond to a card being cast for free due to a dungeon ability?
You should be able to respond to the spell, which my dungeon's ability has you cast and put on the stack. As peteroupc said above, this may have happened because of your Arena settings; when in doubt, use the full control mode.
I'm a former judge (lapsed), who keeps up to date on rules and policy. Keep in mind that judges' answers aren't necessarily more valid than those of people who aren't judges; what matters is we can quote the rules to back up our answers. When in doubt, ask for such quotes.
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-MadMage
However, note the following: