Soltari Champion
The genius of shadow as a keyword is that it solves white weenie's oldest problem (the ground stalls, the bigger team chumps, the board clogs) by simply refusing to let anyone block. Soltari Champion takes that evasion and turns it into a war machine: it is a Glorious Anthem that only fires on the attack, and only on the rest of your team, which means every swing pumps a board of evasive threats while leaving the Champion itself a vulnerable 2/2. That asymmetry is the design discipline doing the work. The anthem is conditional on attacking, so the card cannot sit back as a static lord; it has to commit to combat to earn its keep, and the +1/+1 it hands out goes to everyone except the creature taking the risk. In a deck where the rest of the team also has shadow, that attack trigger reads as lethal math: a clock that grows faster than the opponent can answer because they cannot interact in combat unless they too have shadow. The Soltari were Tempest block's white shadow tribe, and the Champion is the payoff card that asks you to flood the board with small evasive bodies and then reward the alpha strike. It is an aggressive lord built backwards from the usual template: pay for the keyword on the team, not the lord, and the lord's job is to push the whole thing over the top in one swing.

