Cheapest priced copy (The Lost Caverns of Ixalan): $0.35 at Card Kingdom, near mint, their price list as of .
Sinuous Benthisaur 
Creature — Dinosaur · 4/4 · Uncommon · The Lost Caverns of Ixalan · #76
When this creature enters, look at the top X cards of your library, where X is the number of Caves you control plus the number of Cave cards in your graveyard. Put two of those cards into your hand and the rest on the bottom of your library in a random order.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Lost Caverns of Ixalan | 76 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 10 November 2023If X is 1, you'll look at the top card of your library and put it into your hand. If X is 0, you won't look at any cards from the top of your library.