Radha, Coalition Warlord

The trigger is the wrinkle: this Radha keys off becoming tapped, not off attacking, which quietly decouples the payoff from the combat step. Declaring her as an attacker fires it, but so does any tap you can manufacture: a convoke cost, a crewing, a tap-to-activate ability, a Springleaf Drum. The card wants you thinking about what taps a creature outside of declaring attackers, and it rewards a board built to tap on demand rather than one built purely to swing. The pump scales on Domain, so the ceiling is a five-color manabase pushing a +5/+5 onto a single other creature, while a two-color deck is looking at a modest +2/+2. That gap is the honesty of the design: the bonus pays you for stretching your lands across every basic type, and it pays nothing extra if you refuse to. Radha herself stays a flat 3/3 no matter how wide your lands run; the buff always lands on another creature you control, never on her, which makes her a targeting engine that needs a second body to matter. She belongs to a run of Radha printings that have always tied red-green aggression to land accumulation, but where earlier versions turned lands into mana or direct damage, this one converts land variety into a repeatable combat trick that fires the instant the Elf enters a fight or a tap ability wants her turned sideways.