A cheaper card now colours its cost by the size of the discount and explains it on hover. Dragged and held cards show the real cost.
Other changes
Cost colours in your hand: full price stays gold, 1 cheaper is light green, 2 cheaper teal, 3 or more cheaper violet with a glow.
Hover over a discounted cost to see how much and why, e.g. "−2 Rune −1, Shardlight −1". On a phone, hold the card: the large view names it below.
Dragging a card from your hand: the card under your finger shows its current cost, a discount included, not the printed one.
Holding a card in your hand to read it: the large view shows the current cost too. Cards on the board and the opponent's cards keep their printed cost.
