What makes this card amazing is that, in a discard deck, your opponent probably has no cards left
Its worth noting that it does play great against Control, however, so it could become a sideboard staple even in the likes of Gruul Prowess
This lets you conceal info and wait until your end step if you need to keep mana up until the last possible moment
Mesmeric Fiend effect on a 2/2 is usually some decent tempo, it is back breaking against removal light decks (typically combo) and at worst tends to eat a removal spell they would rather have aimed at something more than a Grizzly Bear
Emerge 702.118a Emerge represents two static abilities that function while the spell with emerge is on the stack
For a huge eight-mana, you can unlock Awakening Hall, which has a one-time effect of letting you return all creature cards from your graveyard to the battlefield