Triggered abilities use the word "when," "whenever," or "at." They're often written as "[Trigger condition], [effect]." Some keyword abilities are triggered abilities and will have "when," "whenever," or "at" in their reminder text
The fact that it has convoke means that most people have not actually paid fifteen for it, but it still shares the fifteen-drop slot with only one other creature
A base set and four expansions were released, the last being issued in October 2002
To be honest, things like the Pokemon types, the link cable battles, and the Pokedex were all added later in development based on his suggestions
These cards were never made available to the public, so the only way to get ones hands on it originally was to work for the company
When the creature is exiled, Auras attached to the exiled creature will be put into their owners' graveyards