Cheapest priced copy (Assassin's Creed): $4.49 at Card Kingdom, near mint, their price list as of .
Temporal Trespass 
Sorcery · Mythic · Fate Reforged · #55
Delve (Each card you exile from your graveyard while casting this spell pays for {1}.)
Take an extra turn after this one. Exile Temporal Trespass.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $4.49 to $11.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Assassin's Creed | 86 | Mythic | $4.49 | $4.49 |
| Assassin's Creed | 160 | Mythic | $5.99 | $6.99 |
| Assassin's Creed | 196 | Mythic | — | — |
| Fate Reforged | 55 | Mythic | $5.99 | $8.99 |
| Secret Lair Drop | 2190 | Mythic | $11.99 | $11.99Out of stock |
3 rulings from Wizards of the Coast
- 19 March 2021Delve doesn't change a spell's mana cost or mana value. For example, Treasure Cruise's mana value is 8 even if you exiled three cards to cast it.
- 19 March 2021You can exile cards to pay only for generic mana, and you can't exile more cards than the generic mana requirement of a spell with delve. For example, you can't exile more than seven cards from your graveyard to cast Treasure Cruise unless an effect has increased its cost.
- 19 March 2021Because delve isn't an alternative cost, it can be used in conjunction with alternative costs, such as flashback. It can also be used to pay for additional costs that include generic mana.