The left circular symbol is the characters strength and the right is the characters willpower
If you are going second, or know your opponent will play an Evasive character turn one, follow up with Minnie Mouse Ghost Hunter to give Nick Alert to take most one-cost characters out, or at least make them think twice about questing
What you should consider: Booster boxes like this are among the most expensive sets you can buy
You want to take a fair few creature cards, ideally with keywords like Flying or Lifelink, and then cover them in counters
Could have very easily added Colorless and called it a day, but instead this cool design will make Wizards less money from a lowered ubiquity
These lands will always be able to produce one color of mana, and unlocking the other color of mana is relatively trivial