For the low cost of two mana, this enchantment offers comparable value to an Urza's Incubator, reducing the mana costs of each creature you cast by two mana
Thus, infect creatures only deal 10 damage to the opponent to win the game, effectively cutting their life total in half or doubling the power of all your creatures
Interestingly, the instants matter deck also has an attacking matters subtheme, from the reprint Etali, Primal Storm to the new Nascent Metamorph
One easy way to circumvent this weakness is running High Market so you can sacrifice it at instant speed and prevent it from getting exiled
BPhillipYork: I guess like, Cat deck is a theme in this set or something
Titania, Protector of Argoth Titania, Protector of Argoth may not look like much, but it can take over games so quickly if you combine it with a way to sac lands