1995 rhydon pokemon card | XY—Primal Clash Skyridge Type Rhydon [1st Edition] #45 Prices

Needing to pay two mana is significant, so if you can play the Eternal Soldier alongside Duke Ulder Ravengard, Soulbright Flamekin, or Aurelia, Exemplar of Justice you can do some tricky things

While the effect makes it seem like the best choice is an opponent's powerful permanent, the best target is actually your own

And protection only shows up occasionally, so it doesnt run the risk of becoming too pervasive or broken and its still an amazing way to defend your creatures

Because of these cards rarities, their price tag is on the level of Black Lotus

However, if it doesn't include one of these features, it's legal