Condition met?
Trickbind 1U
Instant
Split second (As long as this spell is on the stack, players can't play spells or activated abilities that aren't mana abilities.)
Counter target activated or triggered ability.
Activated or triggered abilities cannot be played by that card until end of turn.
Im not sure this slows down the format enough but it is a crazy tendrils hoser.
I had responded to you yesterday but the response became lost somehow. I don't think Trickbind is strong enough to really bridle Tendrils-based decks; there's a discussion of this card in the Improvement Forum where I've gone into several reasons why.
-BPK