Cheapest priced copy (Tales of Middle-earth Commander): $2.99 at Card Kingdom, near mint, their price list as of .
Notion Thief 
Creature — Human Rogue · 3/1 · Rare · Masters 25 · #211
Flash
If an opponent would draw a card except the first one they draw in each of their draw steps, instead that player skips that draw and you draw a card.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
7 printings · $2.99 to $29.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Masters 25 | 211 | Rare | $3.49 | $6.99 |
| Dragon's Maze | 88 | Rare | $3.99 | $11.99 |
| Tales of Middle-earth Commander | 270 | Rare | $2.99 | — |
| Secret Lair Drop | 2482 | Rare | $9.49 | $12.99 |
| Secret Lair Drop | 7156 | Rare | — | — |
| Special Guests | 36 | Mythic | $7.99 | $29.99 |
| Zendikar Rising Commander | 96 | Rare | $3.49 | — |
3 rulings from Wizards of the Coast
- 16 March 2018If an opponent is instructed to draw a card then discard a card, and Notion Thief causes you to draw a card instead, that opponent still discards a card. The same is true of any other actions that opponent is instructed to do.
- 16 March 2018If two or more players each control a Notion Thief and a player would draw a card other than the first one in their draw step, that player chooses one of the applicable Notion Thief effects to apply. Then the player whose Notion Thief's effect was chosen repeats this process among the remaining Notion Thief effects, and so on, until there are no more possible such effects to apply. Each effect can be applied to the card draw only once this way.
- 16 March 2018The above procedure means that if each player in a two-player game controls a Notion Thief and one would draw a card, it really will be that player who draws a card.