When Type with a capital T is mentioned in reference to a monster, it is referring to its Monster Type, such as Spellcaster, Dragon, Warrior, Plant, Beast, etc
The game plan revolves around getting as many elves as possible into play and capitalizing on them before you inevitably lose them or win the game
This can all be circumvented if you don't follow the singletons rule or make your own cards
It doesnt leave my side, and it doesnt enter your side, so ETBs dont happen because it did not change zones
Gix, Yawgmoth Praetor While not many people use Gix, Yawgmoth Praetors second ability, its there for when you want to discard a handful of lands and, in turn, play free spells from your opponents side