Mechanics
Urza's Destiny expanded further on some of the mechanics introduced in Urza's Saga.
Several creatures and enchant creatures trigger various abilities when put into a graveyard from play. Famous examples of this mechanic include Pattern of Rebirth, Academy Rector, and Gamekeeper.
Some permanents have the ability to be sacrificed for 2 mana to draw a card, like a cycling ability for cards in play that are no longer useful. Three creatures have this ability in addition to a "graveyard from play" ability. Yavimaya Elder is the most popular, a small green creature that can put three cards in its controller's hand.
There is a class of spells that become more effective as a result of the number of cards of a certain color the caster reveals from his/her hand, as well as a cycle of creatures with abilities that emulate those spells.
Yet another noteworthy aspect is that Urza's Destiny was the first Expert-level set to be printed under the then-new 6th Edition rules changes; the most notable change seen on cards is the text of creatures. Whereas a card like Llanowar Elves would be given "Summon Elf" in previous sets, it would now be given "Creature - Elf".
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Famous quotes containing the word mechanics:
“the moderate Aristotelian city
Of darning and the Eight-Fifteen, where Euclid’s geometry
And Newton’s mechanics would account for our experience,
And the kitchen table exists because I scrub it.”
—W.H. (Wystan Hugh)
“It is only the impossible that is possible for God. He has given over the possible to the mechanics of matter and the autonomy of his creatures.”
—Simone Weil (1909–1943)