Cheapest priced copy (Masters 25): $0.35 at Card Kingdom, near mint, their price list as of .
Iwamori of the Open Fist 
Legendary Creature — Human Monk · 5/5 · Rare · Betrayers of Kamigawa · #130
Trample
When Iwamori enters, each opponent may put a legendary creature card from their hand onto the battlefield.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $0.35 to $2.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Masters 25 | 174 | Uncommon | $0.35 | $0.49 |
| Betrayers of Kamigawa | 130 | Rare | $0.49 | $2.99 |
| The List | A25-174 | Uncommon | $0.35 | — |
One ruling from Wizards of the Coast
- 16 March 2018When Iwamori's triggered ability resolves, first the player whose turn it is (if that player is an opponent) may choose a legendary creature card in hand without revealing it, then each other opponent in turn order may do the same, then all chosen cards are put onto the battlefield at the same time.