Special Summon an equal number of "Mecha Phantom Beast Tokens" (Machine-Type/WIND/Level 3/ATK 0/DEF 0)
You can also activate Fateful Bite for 2 mana at sorcery speed allowing you to sacrifice Radioactive Spider to search your library for a Spider Hero card, reveal it, put it into your hand, then shuffle
Rotom Dex is a bit unorthodox
The subtle incline of its head toward the light can make you think it's looking for prey, but personally, I get the sense that it's just enjoying the way the sun glitters through the water
While you might not think it, Carbink BREAKs measly 20 damage attack is something to worry about, because between Strong Energy, Fighting Stadium, Muscle Band, and the new Regirock-EX, it will be hitting for 40/60/80/90+ every turn, which can soften up some Pokemon for your main attackers to finish off, or even take some KOs if they cant get around Safeguard
Even better, most precons give you multiple directions to develop the deck, by presenting two or more strategies to focus on