You dont need to draw the specific mana for cards like Avatar Aang / Aang, Master of Elements, Atraxa, Grand Unifier and Scion of the Ur-Dragon
You can also cast this for a dash cost to give it haste, and it will then return to your hand at the end of your turn
The Second Chancers (BG) Mechanic: Rouse COST (COST, exile this card from your graveyard: Copy this card
The first was trying to use one-mana accelerants to play a five-power three-drop on Turn 2 and back that up with Stubborn Denial
Ultimately this blue card depends on how easy you can get it out on turn 3 or before, but the potential is there
Cleansing Nova is a moderately-costed board wipe that can either function as a slightly more expensive Wrath of God or hit all artifacts and enchantments instead, which should make for a more one-sided wipe against decks that focus on artifacts/enchantments