When a card says 'you can use any color of mana to cast this spell', the UI appears as if the mana cost was generic, despite there being some edge cases where they behave differently. Either the edge cases should be sorted, or the UI should show the distinction. For example, 'delve' can reduce the generic mana cost, but not the 'any color' mana cost, which has some confusion UI for players.

repro:
1. heist your opponent's 'temporal trespass' with 11+ cards in your graveyard
2. spend all of your mana casting other spells
3. observe that your turn auto-skips, despite reasonably assuming that you could have cast the spell via delve

expected results:
either there is a clear indicator that three of the mana cannot be spent with delve, or else all generic-appearing mana can be delved.

actual results:
despite appearing as a spell that costs 11 generic mana, it actually costs 3 'any color' mana and 8 generic mana. 'any color' and 'generic' look the same, so the UI is unclear.