When she hits the field, her presence alters the entire flow of combat
The Court of Garenbrig makes you the monarch when it comes into play, and then at the start of your next upkeep, you get to dole out two +1/+1 counters across up to two creatures
The error is small when the deck is very large relative to the number of draws, but for typical MTG parameters (60-card deck, 7-card hand), the difference between binomial and hypergeometric results is measurable and can lead to incorrect deck construction decisions
Emerald Collectors payoff to become a 4/4 for 3 mana seems underwhelming when you consider its conjuring one of the most powerful artifacts in the game, but I guess you dont have to use the Mox Emerald on this blue creature
Hes built over 600 decks and still has a long way to go
You dont need to perfectly balance the CMC of your cards with your mana base, but you will want to keep each colors CMC and mana base percentage within 10% of each other (reduce this percentage a little if youre playing with 4 or 5 colors)