Duel Masters had double-faced cards where we printed a card on both sides
T: 52 ($35, 2/$65)
Not adding to the board is brutal, and it's not even efficient card draw until you get to 8 mana
Yes, five mana is a lot in Legacy, but she cannot be Spell Pierced, Elemental Blasted, Gaddock Teegd, or Thaliad and since U/W Control has no Forests, she cannot be Submerged
Theres nothing like a good MacGuffin to set a D&D campaign in motion
On the other hand, most decks in Modern are playing some number of spells, and some popular decks (like Izzet Phoenix) are built around chaining together cheap spells, which makes Thalia, Guardian of Thraben and Vryn Wingmare two of the most important creatures in our deck