Sage of Ancient Lore
Creature — Human Shaman Werewolf
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.
Werewolf of Ancient Hunger
Creature — Werewolf[[ keyword: "Vigilance" ]], [[ keyword: "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.
Slawomir Maniak
Shadows over Innistrad (SOI)
• #225Rulings
The 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.
(wotc • 2016-04-08)
If 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.
(wotc • 2016-04-08)
To 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.
(wotc • 2016-04-08)
Rulings
The 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.
(wotc • 2016-04-08)
If 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.
(wotc • 2016-04-08)
To 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.
(wotc • 2016-04-08)