This way, you can get around the Activate each exhaust ability only once clause
Keldeo belongs to the Swords of Justice, a quartet that includes Cobalion, Terrakion, and Virizion, drawing inspiration from the Three Musketeers with Keldeo as the d'Artagnan figure
A 1/4 with ward 1 defends itself well, and just by attacking and conniving, you can boost Raffine and other creatures you control, and fill your graveyard for shenanigans and value
While the power level of creature-based decks has grown, control has fallen a bit behind
In general, if you have a cheap removal spell in hand, its fine to give it the two +1/+1 counters
As long as neither player is manipulating their library or using their graveyard, using a Millstone does nothing but reveal information until the player being milled runs out of cards, but it took more explanation than you can possibly imagine to make players understand this