Because of the high average converted mana cost I decided to play several mana rocks / accelerators which consists of: Mana Crypt, Mana Vault, Sol Ring, Arcane Signet, Dimir Signet, Grim Monolith, Sapphire Medallion, Talisman of Dominance, and Commander's Sphere
By the end of this turn you will have Fusion summoned, Synchro summoned, Xyz summoned and have a field filled with monsters that can pretty much shut down anything your opponent would want to do
Noivern ex From ex Starter Decks: Generations [C] Strafe: 50 damage
The ability to cast a spell and then have it recast for free on all future turns is just insane value
Persistent Constrictor shrinks creatures over time and deals tiny chip damage as well
This was pre-boom so if it does happen to be re-sealed it wont hurt as much