Relics
Void Prism
In each battle, the first card of each of the first 3 elements costs 1 Energy less.
Numbers from the current game data
Strategy & Tips
Tactical notePlay the first cards of up to three elements in the order that makes each discount useful; it rewards a flexible multi-element turn, not a mono-element synergy plan. Avoid holding a vital card solely for a discount you cannot use.

Soul Strip: Waifu Card Battler
Check cards, relics, and enemies before your next run. Every number comes from game data, and the Steam demo is free.
Wishlist on Steam