Cheapest priced copy (Fate Reforged): $0.49 at Card Kingdom, near mint, their price list as of .
Shu Yun, the Silent Tempest 
Legendary Creature — Human Monk · 3/2 · Rare · Fate Reforged · #52
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Whenever you cast a noncreature spell, you may pay {R/W}{R/W}. If you do, target creature gains double strike until end of turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $0.49 to $2.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Fate Reforged | 52 | Rare | $0.49 | $0.99 |
| Fate Reforged Promos | 52s | Rare | — | $2.79 |
| The List | FRF-52 | Rare | $0.49 | — |
4 rulings from Wizards of the Coast
- 24 November 2014Prowess goes on the stack on top of the spell that caused it to trigger. It will resolve before that spell.
- 24 November 2014Once it triggers, prowess isn’t connected to the spell that caused it to trigger. If that spell is countered, prowess will still resolve.
- 24 November 2014Prowess triggers only once for any spell, even if that spell has multiple types.
- 24 November 2014Any spell you cast that doesn’t have the type creature will cause prowess to trigger. If a spell has multiple types, and one of those types is creature (such as an artifact creature), casting it won’t cause prowess to trigger. Playing a land also won’t cause prowess to trigger.