Sunspire Gatekeepers
A 2/4 for four mana sets a floor that blocks all day and shrugs off early aggression on its own, which matters because everything above that floor is conditional. The Gate clause is where the design earns attention: commit to the land subtheme and the body shows up with a 2/2 vigilance Knight attached, turning one defensive blocker into a pair that can press an attack and still hold the line. That is a genuine swing in board presence for a deck already assembling Gates, and it asks for nothing beyond a land count when the creature lands. The whole card lives on that "two or more" threshold, and it lives there cleanly because of how an intervening "if" behaves. Control fewer than two Gates as the creature enters and the ability never triggers in the first place: it does not go on the stack, there is no resolution to watch, no token withheld at the last moment, just a body that does the body's job. The condition is checked at the door, and again on resolution. That structure is the point. The card never punishes you for coming up short on Gates; it simply declines to pay out, which is the gentlest way to make a build-around feel like one whole thing rather than a creature bolted to a rider. The payoff is woven into the creature so the land-matters deck wants the bodies and the bodies want the lands, and the deckbuilding choice the subtheme was already nudging toward is exactly what flips the switch.
