FOILCheapest priced copy (Kaladesh): $0.49 at Card Kingdom, near mint, their price list as of .
Madcap Experiment 
Sorcery · Rare · Kaladesh Promos · #122s
Reveal cards from the top of your library until you reveal an artifact card. Put that card onto the battlefield and the rest on the bottom of your library in a random order. Madcap Experiment deals damage to you equal to the number of cards revealed this way.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.49 to $1.29 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Kaladesh | 122 | Rare | $0.49 | $0.49 |
| Kaladesh Promos | 122s | Rare | — | $1.29 |
4 rulings from Wizards of the Coast
- 20 September 2016Once Madcap Experiment begins resolving, no player may take any actions other than those specified by Madcap Experiment until it's done resolving.
- 20 September 2016Any abilities that trigger as the artifact enters the battlefield aren't put onto the stack until Madcap Experiment is done resolving.
- 20 September 2016The number of cards revealed this way includes the artifact card you put onto the battlefield.
- 20 September 2016If you don't reveal an artifact card, you'll randomize your library and be dealt damage equal to the number of cards in your library.