I see two problems with this section. First, the rules are overly verbose and note things that I don't think are necessary. For example, "You may play that card during the same turn if you wish." I don't know of any games where you draw a card but can't use it. Many of the rules are given multiple times. Search these out and eliminate the extra mentions.
Secondly, we lack context for some of the instructions. What we need to know is the process of playing, upgrading, and powering a card to attack. If you add brief summaries of the use of each card type as suggested above, this would help. Otherwise you could have a preliminary section that explains how these things interact.
The following are some specific comments/questions.
For b) could say, "Perform any or all of the following actions/effects in any order." You don't really need the "Note that playing Armory Cards..." paragraph as long as it is clear that a-c are steps to be done in order.
I would then add d) If you did not attack, draw a card. Again, the "Note" paragraph isn't really needed. "If your active unit does not have enough power to attack...": Can you just choose not to attack and draw a card?
"If the attack for your unit card says coin flip, you must flip a coin in order for your attack to hit.": Does it require a certain result?
"Now it is your opponent’s turn . They start their turn...": This paragraph should be eliminated. Rather, have a note at the end of the outline that play continues to alternate.
I would also add "e) Check for victory" to the turn outline.
It's not clear how coin flips are resolved. I assume you call heads or tails, but it could be explicitly stated.