Cheapest priced copy (Throne of Eldraine): $0.35 at Card Kingdom, near mint, their price list as of .
Sage of the Falls 
Creature — Merfolk Wizard · 2/5 · Uncommon · Throne of Eldraine · #63
Whenever this creature or another non-Human creature you control enters, you may draw a card. If you do, discard a card.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Throne of Eldraine | 63 | Uncommon | $0.35 | $0.49 |
| Jumpstart 2022 | 340 | Uncommon | $0.35 | — |
2 rulings from Wizards of the Coast
- 4 October 2019If more than one non-Human creature enters the battlefield at the same time, Sage of the Falls's ability triggers that many times. You'll resolve the abilities one at a time—you won't draw that many cards at once and then discard that many cards.
- 4 October 2019You draw a card and discard a card all while Sage of the Falls's ability is resolving. Nothing can happen between the two, and no player may choose to take actions.