First Things First: What Are Foil Cards
Kefka, Court Mage (Borderless) 3
Im relatively pleased with the presence of Esper Sentinel as #5 on my list
Your creatures will be faster, stronger, and more burdensome for your opponent if you can create ways to get to 5 mana quickly
If you're playing an aggressive or midrange tribal deck and you're only including sixteen creatures, you have to ask yourself: "Is it even worth playing all of these tribal cards in the first place?" If, for example, you only have enough creatures to have a couple in play at any given time, you're not maximizing your tribe's abilities
Since the card is currently only being played in just one modern deck, I personally had it in the third spot behind the best blue reactive spells in the format, Counterspell and Force of Negation, but I can see the number one spot going to the best and most efficient threat the color has to offer