You can play a number of different strategies to suit the mood, and since there are so many, theyll keep you engaged and interested for a long time
Of note, the buyback spells Allay and Shattering Pulse cost five mana to cast with buyback, which is exactly what Sonic Rainboom provides
Depending on your deck, you might also want to look at Clever Concealment, Flawless Maneuver and Cosmic Intervention the latter of which is a lot of fun with fetchlands and mass land destruction, or board wipes when you run a lot of strong EtB effects
To trigger Void, we need to either Warp a card, or have a nonland card leave the battlefield from your control
The ultimate is good, but not if your opponent has ways to get a ton of life
Cuts We're taking out the cute subthemes