#copiable values

706.2 When copying an object, the copy acquires the copiable values of the original object’s characteristics and, for an object on the stack, choices made when casting or activating it (mode, targets, the value of X, whether it was kicked, how it will affect multiple targets, and so on). The “copiable values” are the values derived from the text printed on the object (that text being name, mana cost, color indicator, card type, subtype, supertype, rules text, power, toughness, and/or loyalty), as modified by other copy effects, by its face-down status, and by “as . . . enters the battlefield” and “as . . . is turned face up” abilities that set power and toughness (and may also set additional characteristics). Other effects (including type-changing and text-changing effects), status, and counters are not copied.

Background: Two cards from the Scars of Mirrodin block. Combos with any permanent with "whenever another creature enters the battlefield (under your control)" triggered abilities, such Suture Priest and Warstorm Surge. Requires understanding of triggered abilities and copiable values.

How it works: The trick is to have Phyrexian Metamorph enter the battlefield as a copy of Leonin Relic-Warder with another permanent that has a "whenever another creature enters the battlefield (under your control)" triggered ability.

706.2a A copy acquires the color of the object it’s copying because that value is derived from its mana cost. A copy acquires the abilities of the object it’s copying because those values are derived from its rules text. A copy doesn’t wind up with two values of each ability (that is, it doesn’t copy the object’s abilities and its rules text, then have that rules text define a new set of abilities).

706.5. An object that enters the battlefield “as a copy” or “that’s a copy” of another object becomes a copy as it enters the battlefield. It doesn’t enter the battlefield, and then become a copy of that permanent. If the text that’s being copied includes any abilities that replace the enters-the-battlefield event (such as “enters the battlefield with” or “as [this] enters the battlefield” abilities), those abilities will take effect. Also, any enters-the-battlefield triggered abilities of the copy will have a chance to trigger.