Senior game designer and TMNT set design lead Eric Englehard says the blue Rare Krang is meant to capture his mad scientist vibes (and in the background, you'll see various artistic iterations of his mecha-suits from the design team), while his Utrom Warlord Mythic card highlights how much of a threat Krang can be to the Turtles
While it can help if your opponent is on a strategy that involves Fire Energy (with notable examples at the time including Eevee Grove Flareon ex and Shining Revelry Charizard ex), it is otherwise completely useless
Every pack contains a spread of up to six rare, up to six uncommons, and up to five common cards, along with a single full-art Land card
You can earn those Blood tokens also through Shilgengar
Irenicus's Vile Duplication works best with decks that care about instants and sorceries and/or ones that have a commander that benefits from evasion, like Kalamax, the Stormsire