Valcho Control

This list will likely require some tweaking but there’s no denying that Valkyrie is a fantastic combo with Echo! Valk can be countered by cards with ongoing abilities that increase their power, so adding Echo should help mitigate that counter. Stack a bunch of cheap things in one location then throw down valk on turn 6 for a big swing!

Daredevil + prof X to steal another lane and Jeff to help add bonus power if you fall short!

Kitty Pryde could do wonders here too if you need a replacement!