You'll switch to the double-faced card when the card is on the stack, on the battlefield, in the graveyard, or exiled face-up
Casting big creatures also grows this, combating the general weakness of mana dorks becoming irrelevant later in the game
Its a planeswalker killer in potential, can give you life because its a food creature, and also grows when other artifacts are destroyed or sacrificed
Impulse Impulse may not be the strongest card around, especially since it doesnt give you any card advantage, but it shines in combo strategies that require you to find key pieces to win the game or put you ahead
The reason behind this is that if a land is ok, 2 might not be
Don't forget about the clues and lessons that are core to the set, and of course, the legendary characters Appa, Steadfast Guardian, Wan Shi Tong, Librarian and The Lion-Turtle