Riftmancer's Tome

Riftmancer's Tome enters the battlefield with a
page counter on it for each color of mana spent
to cast it. Whenever you cast a multicolored spell,
you may remove a page counter from
Riftmancer's Tome. If you do, draw a card.
{t}: Add one mana of any color to your mana
pool.
Landfall —Whenever a land enters the battlefield
under your control, put a page counter on
Riftmancer's Tome.