Wan Shin Tong's Library

When Wan Shin Tong's Library enters the battlefield, it enters tapped unless you
sacrifice an artifact or discard a card from your
hand.
{u}{u}{u}: Sacrifice Wan Shi Tong's Library,
draw 3 cards.
{t}: Add two mana in any color combination.
"To prove your worth as scholars, you have to contribute some worthwhile knowledge."