Shadowverse

As for the Vale deck, it’s probably the most expensive playable deck right now. I have a non-optimized list without a full set of Curve cards. An optimized deck needs at least 4 full sets (Insect Lord, Curve, Cassie, Macaque) + Selvin, the guy with the axe (ideally also full sets) + you can add Yggdrasil there (not a must-have, but a decent card) and some other minor cards. And a bunch of gold. But the Sylvan faction has an alternative in the form of an aggro deck, which can function without any legendaries. But things like the Dungeon faction and others are a pain.