When Hostage Taker enters the battlefield, exile another target creature or artifact until Hostage Taker leaves the battlefield
Valley Rotcaller is even better
The 2-prize duel in the upper room is absolutely brutal since it actually uses a legit strategy and a pretty decent decklist containing Scyther, Wigglytuff, Mysterious Fossil (+random evos)/Clefairy Doll and at least 3 Bill and Oak from what I recall
Great counter support cards like Michelangelo, Weirdness to 11, Danny Pink, and Innkeeper's Talent are worthy inclusions to your mutant deck, as are proliferate effects
Though it isn't exactly card draw , creatures like Wrexial, the Risen Deep and Mindleech Mass both give us some card advantage by plucking things out of your opponents' graveyards and hands and casting them for free