While that wont matter most of the time, especially because your deck is going to be filled with creatures who have Morph and Disguise, there will be times when that comes up
Triggered abilities use the words "when," "whenever," or "at." They're often written as "[Trigger condition], [effect]." Some keyword abilities (such as prowess) are triggered abilities and will have "when," "whenever," or "at the beginning of" in their reminder text
Its still a graveyard
Giving you four mana on your first turn catapults you wildly ahead of your opponents and lets you do practically anything you want on your first turn
Each one solves fundamental problems that the majority of decks face while providing exceptional value across multiple archetypes
I mean, thats my speculation, anyway