Tecutlan, The Searing Rift is buged
The trigger off of Tecutlan, The Searing Rift is buged, is does not allow for you to respond to it's Descend trigger with instant spells!
This happened to me twice in the same game!
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Rezzahan#77802
commented
To respond to your own spells and abilities, you have to be in Full Control BEFORE they go on the stack. If you can anticipate, when a trigger will go off, it's best to set a stop there.
And just to be sure, Brass's Tunnel-Grinder will only trigger, if you have decended BEFORE the end step begins. There will be no trigger if ylou go to the end step and that is not the case, due to it having an intervening-if clause, which is essentially an extension of the trigger condition.