Enchantment, 2WW (4) Each other non-Aura enchantment is a creature with power and toughness each equal to its converted mana cost. It's still an enchantment.1
Illus. John Avon
10/4/2004: Does not animate itself. But can be animated by another Opalescence.
2/1/2006: With a Humility and two Opalescences in play, if Humility has the latest timestamp, then all creatures are 1/1 with no abilities. If the timestamp order is Opalescence, Humility, Opalescence, the second Opalescence is 1/1, and the Humility and first Opalescence are 4/4. If Humility has the earliest timestamp, then everything is 4/4.
2/1/2007: The interaction between Humility and Opalescence has changed due to the new layering rules. The type-changing effect still applies at layer 4, like it previously did, but the rest happens in the applicable layers. The rest of it will apply even if the permanent loses its ability before it's finished applying. So if Opalescence, Humility, and Worship are in play and Opalescence came into play before Humility, the following is true: Layer 4: Humility and Worship each become creatures that are still enchantments. (Opalescence). Layer 5: Humility and Worship each lose their abilities. (Humility) Layer 6: Humility becomes 4/4 and Worship becomes 4/4. (Opalescence). Humility becomes 1/1 and Worship becomes 1/1 (Humility). But if Humility came into play before Opalescence, the following is true: Layer 4: Humility and Worship each become creatures that are still enchantments (Opalescence). Layer 5: Humility and Worship each lose their abilities (Humility). Layer 6: Humility becomes 1/1 and Worship becomes 1/1 (Humility). Humility becomes 4/4 and Worship becomes 4/4 (Opalescence).
8/1/2008: A noncreature permanent that turns into a creature is subject to the "summoning sickness" rule: It can only attack, and its {T} abilities can only be played, if its controller has continuously controlled that permanent since the beginning of his or her most recent turn.
Urza's Destiny
(Rare)