We want them vampires for cheap If many inexpensive vampires are packed into the deck, a protective wall can be built up in the early rounds thanks to the additionally generated tokens, until more expensive creatures like Malakir Bloodwitch or Olivia Voldaren can be brought into play later on to shift the balance of power in ones own favour
Reclamation Sage is a very popular way of getting rid of artifacts and enchantments, and Cankerbloom presents an appealing alternative for counter-based decks
It's a low opportunity cost card that can help sink excess mana into a great static effect, with level three offering an alternate win condition in the same vein as Young Pyromancer without the same level of investment or vulnerability to common removal spells
You cast spells by spending mana
Amusingly enough, these don't include the World Shaper precon's face commander, but rather the deck's alternate leader Hearthhull, the Worldseed alongside Tannuk, Memorial Ensign