This is a lot of power packed into the commander Lord Xander, and the guaranteed half-board wipe is a strong method of deterrence
Toph, the First Metalbender Toph, the First Metalbender would qualify as a build-around with either of it's two abilities
Her alt-commander is Celes
Traditional Legacy Death and Taxes decks play a lot of cards with activated abilities and this cards ability is symmetrical so it would best fit in a deck that wouldnt have to build around it to play it
Aside from the suite of effects like Windborn Muse, No Mercy, and Teysa, Envoy of Ghosts (who also makes additional bodies for us to sac later), we additionally have a few more unique cards that play into our overall strategy
It doesnt matter whether that player found a card during the search