That's to reflect the episode where Clara becomes the Impossible Girl, entering The Doctor's life at every point in the timestream to help him out
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Well, I can say they are so much fun
All three Leaders are the same dual-colourPurple and Redwhich marked the first time this combo was used
In the context of the card, it appears to be wordplay on the fact that the word "present" can refer to a gift you give to someone (in which case, it's pronounced like "pleasant") or the act of showing something off (in which case, it's pronounced like "prevent"), and the effect appears to be using both meanings at the same time
Wrathy is an eight mana 6/6 with Flying, first strike, vigilance, trample, haste, protection from Black, and protection from Red