Should creatures keep dying turn after turn, it wont be long before Sance Board generates obscene amounts of mana
Caesar hits so many favorites for me: hes inexpensive, hes got a decent power and toughness, and with a little sacrifice, he becomes a problem quickly while doing everything that Soldiers wants to do, make more Soldiers and deal damage
This particular card works best in synergistic artifacts-matter Commander decks like Osgir, the Reconstructor and Breya, Etherium Shaper
Broken down in terms of expense though, this matches the value of a two-cost character plus Be Our Guest in one card
You can then use this card to chump block and sacrifice it to go find a land, giving you a bit of extra time and mana
Ill break down each color (which will include multicolored and colorless), pick a Top 3, and give the color a grade