5 mana is a lot for that but white traditionally hasn't had great card draw and if you can afford the 5 it should net you a lot of cards
Chimil, the Inner Sun Our top colorless card, artifact, non-common, permanent and legendary card is this six-drop amazing card
Its ability to generate extra mana for just one generic mana makes it ideal for enabling powerful turn-one plays
SE Secret Rare Scarr, Scout of Dark World X DARK Level 2 [ FiendEffect ] ATK 500 DEF 500 If this card is destroyed by battle and sent to the GY: Add 1 Level 4 or lower "Dark World" monster from your Deck to your hand
Lets check out how they work out: Drifblim has a neat 100 HP but does only 20 DMG for 2 Energy
Junk Synchron + 1 or more non-Tuner monsters Once per turn, you can select 1 monster your opponent controls, and change its battle position