White - Sunscour
Why: Free Wrath. What more do I need to say?
White - White Shield Crusader
Why - Flying pump knight!
Blue - Flashfreeze
Why - Limited 2-mana hard counter that hoses up agro. Sideboard worthy, at the very least.
Blue - Perilous Research
Why: 2 mana, instant speed card drawing.
Black - Stromgald Crusader
Why: Flying pump knight!
Black - Soul Spike
Why: 8-point life swing for free, which leaves you with mana to do other mean things.
Red - Martyr of Ashes
Why: Programmable Pyroclasm.
Red - Lightning Serpent
Why: The b*****d love child of Fireball and Ball Lightning.
Green - Ohran Viper
Why: Ophidian + Basilisk ability = profit!
Green - Boreal Druid
Why: 1/1 mana elf for 1.
Artifacts - Mishra's Bauble
Why: 0 mana to look at the top of someone's library and draw a card.
Lands - Mouth of Ronom
Why: Gives green a way to kill creatures.
Lands - Scrying Sheets
Why: Card advantage.