Cheapest priced copy (Kaladesh): $0.49 at Card Kingdom, near mint, their price list as of .
Fateful Showdown 
Instant · Rare · Kaladesh · #114
Fateful Showdown deals damage to any target equal to the number of cards in your hand. Discard all the cards in your hand, then draw that many cards.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.49 to $2.29 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Kaladesh | 114 | Rare | $0.49 | $1.49 |
| Kaladesh Promos | 114s | Rare | — | $2.29 |
3 rulings from Wizards of the Coast
- 20 September 2016If Fateful Showdown's target becomes an illegal target, you won't discard your hand or draw any cards.
- 20 September 2016The number of cards in your hand is counted only as Fateful Showdown resolves. Fateful Showdown is on the stack at this time, so it's not counted.
- 19 January 2018There are many important moments in the story, but the most crucial—called “story spotlights”—are shown on cards. These cards have the Planeswalker symbol in their text box; this symbol has no effect on gameplay. You can read more about these events in the official Magic fiction at http://www.mtgstory.com.