Coral Colony⁣ - Dominaria United⁣ (Uncommon)⁣ [45]

Coral Colony is a 1/4 Wall creature that can't attack but can block incoming creatures effectively due to its high toughness. You can pay {1}{U} and tap it to make an opponent mill a number of cards equal to how many creatures with defender you control, which can be a sneaky way to deplete their library while staying defensive. This card shines in decks that focus on a defender strategy, but its downside is that it can’t attack, so if you're not generating enough defenders, its milling ability might not be very impactful.