Commander Zhulodok, Void Gorger Colorless spells you cast from your hand with mana value 7 or greater have "Cascade, cascade." (When you cast one, exile cards from the top of your library until you exile a nonland card that costs less
For example, a card like Elesh Norn can totally shut down aggro but is near-useless against a deck that's going to combo-kill you with sorceries next turn
This digs you seven deep into your deck and can put any two combo pieces into play, all for just four mana
Card Draw For Counter-related goodies, we've got Inspiring Call which holy moly is this card ridiculous, but also other goodies like The Great Henge and Tezzeret's Gambit
Unfortunately, those tokens do get sacrificed at the next end step, but that only seems fair since otherwise, it would be a bit too powerful
(Trap is better than another Duress in the board because mana can be tight early.) The matchup is essentially a race, with Junk trying to keep Tendrils off-balance long enough to win