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Set: Titan Masters Attack
🠪 When your opponent plays an Action and it's the second Action they played this turn.When Revealed
🠪 Scrap that Action and it has no effect. Your opponent can't play Actions this turn.
Do Secret Actions count?
Yes. The game will see a Secret Action played face down as an Action.
Source: Wave 5 FAQ
Do character abilities still trigger if the requirements are met through cards played but negated by the opponent or otherwise?
For example, Wave 1 Thundercracker’s bot mode ability --> Player 1 uses Supercharge, but player 2 reveals Infiltrate and negates Supercharge. Does Thundercracker's ability still trigger because an action was played? Meaning he would indeed get +1?
The Infiltrate will scrap the action you played and negate its effect, but Thundercracker’s ability still triggers because you played an action.
Source: Rules Roundup 2019-07-29