It may cost 5-mana, but with enough troops on the battlefield, Ohran Frostfang poses a nasty question to your opponents: Do you trade away your blockers to a swarm of Deathtouch-happy critters, or do you take the damage and let me draw a whole bunch of cards
I may be missing something, so Ill be democratic and trust the popular opinion
The key interaction lies in warp: You can play this as a 2-mana card, then flicker it with cards like Ephemerate and Phelia, Exuberant Shepherd to get a 4/6 flier that drew two cards for a frankly unfair amount of mana
It is sorcery rather than instant but if offers exile and the ability to combine with other damage sources to kill things with more than four toughness
Whats better than playing free spells from exile
The one-two punch of new-player-friendly sets Bloomburrow and Foundations last year succeeded in rekindling interest in the format