Tishana's Tidebinder countering Balustrade Wurm
I had delirium active, and attempted to cast Balustrade Wurm from my graveyard. In response, my opponent cast Tishana's Tidebinder targeting the wurm. When the trigger resolved, my balustrade wurm simply disappeared; it was not in my graveyard, in exile, or on the battlefield.
How could the tidebinder's ability affect the wurm, which "cannot be countered"? Furthermore, why did the wurm disappear entirely? Is this a gameplay and/or visual bug?
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Rezzahan#77802
commented
You were not casting the Balustrade Wurm from your graveyard, you activated an ability to return it to the battlefield from the graveyard. And activated abilities can be countered with Tishana's Tidebinder's trigger. The target was the activated ability of the Wurm. And since you did not cast it, it being uncounterable as a spell is irrelevant.
As for where it went, it should be left in the graveyard, since nothing moved it out of there.