Odysseus, Crafty and Wise

When Odysseus, Crafty and Wise enters the Battlefield, choose a number between 1 and 10. Whenever you cast a spell with that mana value, power, or toughness equal to that number, search your library for another card with mana value, power, or toughness equal to the same number, and you may play it without paying its Mana cost.

“Tell me, muse, the story of that resourceful man, who was driven to wander far and wide after sacking the Holy Citadel of Troy.”—The Odyssey