Cheapest priced copy (Mirrodin): $0.35 at Card Kingdom, near mint, their price list as of .
Mindstorm Crown 
Artifact · Uncommon · Mirrodin · #207
At the beginning of your upkeep, draw a card if you had no cards in hand at the beginning of this turn. If you had a card in hand, this artifact deals 1 damage to you.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mirrodin | 207 | Uncommon | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 1 December 2004Mindstorm Crown cares about the number of cards in your hand at the time the turn started, not as the ability resolves. So if you have more than one Crown on the battlefield and no cards in your hand at the start of the turn, you draw a card for each Crown.
- 1 December 2004Mindstorm Crown’s ability doesn’t have an “intervening ‘if’ clause.” It always goes onto the stack at the start of your upkeep.