If you find a way to damage your opponent, either through combat damage or with a damage spell (such as [c]Lightning Bolt[/c]), you can play this spell for only one red mana, which is quite the bargain
Skullclamp Have you heard the one about Skullclamp
Returning two small things from the 'yard to play for five or six mana doesn't sound that awesome, but ReveillarkReveillark makes up for the somewhat restrictive cost with combo potential alongside Karmic GuideKarmic Guide and Viscera SeerViscera Seer: Saffi EriksdotterSaffi Eriksdotter and Altar of DementiaAltar of Dementia work as combo pieces, too, among other options, making the 'Lark an important role player in decks like Teysa KarlovTeysa Karlov, Karador, Ghost ChieftainKarador, Ghost Chieftain, and Alesha, Who Smiles at DeathAlesha, Who Smiles at Death
Similarly, anyone playing Llanowar Wastes will get a bonus (more on this later)