Yod comes up in many of the cards such as the Ace of Swords, Wands, and Cups, and in the Tower (the falling flames) because of its deep symbolic meaning.
When we initially look at most Aces, there isn’t as much symbolism as the rest of the cars. However, there are still key images within the cards that help to give us clues and insights to their properties.
In numerology, 10 would always reduce to 1, but in the Tarot, 10 has it’s own meaning and correlation, and thus while it can be reduced, it isn’t. Thus, there is a special link between the two numbers, in that both resent and end and a beginning.