You can have up to five cards here
Yes, you can use this on Urzas Saga with the third lore counter ability still on the stack, activate it to generate a colorless mana, put it on the bottom of your library and then tutor for a 0 or 1 drop artifact, shuffling your Urzas Saga back to a random location in your deck to reuse it later
And when you have so many Lands in one deck (44!), you really do need to have Sylvan Awakening as a potential late-game finisher
(Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.) When a Dragon you control enters, return this enchantment to its owner's hand
No, not the mobile game, but the TCG set made to celebrate it
But regardless, Shipping was fast and everything came in nicely