There are two options for which goblin to pick, one choice is Mogg Fanatic which give us the ability to sacrifice all our Snoop copies to deal damage directly to our opponent and finish the game
Baneslayer Angel is one of the most classic sideboard threats of all-time, both in aggro decks looking to go bigger and in control decks looking to exploit opponents removing creature-kill after the first game
These last two are new information as previously the decks were advertised as coming with a rulebook
Since indestructible doesn't prevent damage, an indestructible planeswalker will still have loyalty counters removed if it's hit with a burn spell, and that planeswalker will die if it hits 0 loyalty
This is only when you first play Elsa, but it can be devastating and game changing depending on what cards your opponent was hoping to use against you
On the upper end of the spectrum, Summon: Bahamut costs a staggering nine mana