I second the defense grid suggestion. If their answers are sorcery speed then sandbag until you have the mana to resolve everything in one turn when their shields are down. Cards like hall of gemstone are good at stopping interaction, and you can change a few cards in your deck to be more reactive so you can interfere with them (mind twist is fun, sadistic hypnotist may work with your tokens, withering boon and beast within/abrupt decay effects to keep them off balance).
Links to my most current deck lists;
Primary EDH; Rakka Mar Token Perfection, Crosis Mnemonic Betrayal, Cromat Villainous, Judith Gravestorm, Rakdos Empty Storm, Exava Artifacts, Bant Trash, & Fumiko Voltron!
EDH kept at home; Ruzzian Isset & Rakdos LoR!
EDH (nostalgic/pimp/retired) in storage;
Latulla Burns, Akroma Smash, Jeska Voltron, Rakdos Storm, Bladewing Darghans, Lyzolda Worldgorger, Xantcha Steals your Heart, Jori Storm, Wydwen Permission, Gwendlyn Paradox, Jeleva Warps, & Sigarda Brick!
Legacy Showanimator and High Tide!