The other option costs two black mana, and allows a target player to draw three cards and lose three life
While Solitude is awesome, and the same can be said for Esper Sentinel, players will always be left asking thanks, whats next? Until white gets redundant effects, people will still be left wanting, but furthermore, jealous when colors like green get to explore previous white space (Sanctum Weaver) or space green hasnt yet (Yavimaya, Cradle of Growth)
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(2020-11-10) An effect that checks whether you control your commander is satisfied if you control one or both of your two commanders
You are also limited to drawing cards only once on your turn, and only once barring something odd like Relentless Assault or double strike