Erratic Raptyr

Description
Rebirth After this minion attacks or counterattacks, turn it into an Egg.

Interactions
Raptyr has some very quirky (bugged?) interactions:
 * When destroyed outside of combat, Raptyr behaves like a normal Rebirth minion.
 * When Raptyr is the one attacking, then it never dies (even if the counterattack would be for a lethal amount of damage!) and instead always transforms into an egg. In particular, any kind of on-death effect will not trigger. This makes it a good choice for a Keeper of the Vale deck because most of the time Raptyr won't pollute Keeper's card pool.
 * The tricky case: If Raptyr is attacked for a lethal amount of damage and successfully counterattacks, then it appears as though it first dies, but then transforms into an egg.
 * So on-death effects will occur, for example:
 * 1) Deathwatch effects trigger
 * 2) Capricious Marauder will change control
 * 3) Oblivion Sickle counts it as being destroyed
 * 4) Infest triggers
 * 5) Wraithlings summoned by Necrotic Sphere or Dark Transformation
 * However, since the egg comes from transformation, on-summon effects won't occur:
 * 1) The Raptyr egg will always appear and won't be overwritten by Spinecleaver, Gibbet, Rage Reactor, White Asp etc.
 * 2) Dreadnought will not buff the egg
 * 3) Venom Toth and Crimson Oculus will not trigger

Balance Changes
v. 1.92 - added with the Immortal Vanguard expansion.