Cheapest priced copy (The Lost Caverns of Ixalan Commander): $0.35 at Card Kingdom, near mint, their price list as of .
Sage of Fables 
Creature — Merfolk Wizard · 2/2 · Uncommon · Morningtide · #47
Each other Wizard creature you control enters with an additional +1/+1 counter on it.
{2}, Remove a +1/+1 counter from a creature you control: Draw a card.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.35 to $6.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Lost Caverns of Ixalan Commander | 169 | Uncommon | $0.35 | — |
| Morningtide | 47 | Uncommon | $0.49 | $6.99 |
4 rulings from Wizards of the Coast
- 1 April 2008The effects from more than one Sage of Fables are cumulative. That is, if you have two Sage of Fables on the battlefield, Wizard creatures you control enter with two additional +1/+1 counters on them.
- 1 April 2008If Sage of Fables enters at the same time as another Wizard (due to Living End, for example), that creature doesn't get a +1/+1 counter.
- 1 April 2008The creature gets the counter if it would enter under your control. It doesn't matter who owns the creature or what zone it enters from (such as your opponent's graveyard, for example).
- 1 April 2008If a Wizard would normally enter with a certain number of +1/+1 counters on it, it enters with that many +1/+1 counters plus one on it instead. If a Wizard would normally enter with no +1/+1 counters on it, it enters with one +1/+1 counter on it instead.