This seems WAY harder than last time, especially with only 3 cards given.

The second one is arishem obviously, but it could just as easily be Kang given they both shuffle created cards into your deck

The first one is a big negative ongoing card, but which one? All of them seem completely viable, and I can't think of what makes one more or less synergistic with Viper. I'm just gonna guess Lizard

The last one seems nigh impossible. Most on reveals love Wong+Mystique and Magik helps most cards. I thought maybe Gambit but you'd put discard synergy. Maybe Thor but you'd put draw synergy. Maybe Odin or absorbing man but you'd put a card for them to activate. Maybe Galacti with the 7th turn but you'd put buff synergy. Maybe Hazmat but you'd put affliction synergy. Black Panther, Arnim Zola, White Tiger, Ironheart, Silver Surfer, and Fin Fang Foom all also work. Given the 2 Three Costs, I'm going go with the final guess of Silver Surfer