Cheapest priced copy (Shadows over Innistrad): $0.69 at Card Kingdom, near mint, their price list as of .
Sage of Ancient Lore // Werewolf of Ancient Hunger 
Creature — Human Shaman Werewolf // Creature — Werewolf · */* · Rare · Shadows over Innistrad · #225
Sage of Ancient Lore's power and toughness are each equal to the number of cards in your hand.
When this creature enters, draw a card.
At the beginning of each upkeep, if no spells were cast last turn, transform this creature.
Vigilance, trample
Werewolf of Ancient Hunger's power and toughness are each equal to the total number of cards in all players' hands.
At the beginning of each upkeep, if a player cast two or more spells last turn, transform this creature.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.69 to $4.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Shadows over Innistrad Promos | 225s | Rare | — | $3.99Out of stock |
| Shadows over Innistrad | 225 | Rare | $0.69 | $4.49 |
3 rulings from Wizards of the Coast
- 8 April 2016The abilities that transform a Werewolf back and forth look at the entire previous turn, even if the Werewolf with that ability wasn't on the battlefield for some or all of that turn.
- 8 April 2016If you have no cards in hand after Sage of Ancient Lore enters the battlefield, it will be put into your graveyard before its first triggered ability resolves. You'll draw a card, but Sage of Ancient Lore will already be gone.
- 8 April 2016To trigger the Werewolf's back face's transform ability, a single player must have cast two or more spells during the previous turn. If multiple players each cast just one spell during the previous turn, the ability won't trigger.