The reason for doing this is because very few common cards hold value
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
Mono-Blue Devotion 4 Spectral Sailor 4 Brineborn Cutthroat 4 Thassas Oracle 4 Brazen Borrower 4 Callaphe, Beloved of the Sea 1 Wavebreak Hippocamp 4 Gadwick, the Wizened 4 Thassa, Deep-Dwelling 2 Quench 3 Leyline of Anticipation 2 Thassas Intervention BLACK DEVOTION Key Cards Erebos, Bleak-Hearted looks strong with Witchs Oven and Cauldron Familiar, and with Gray Merchant of Asphodel
A bounced creature always return to its owners hand regardless of who controlled it on the battlefield
As for heavy backrow decks, I've only faced a couple and both were generally uphill fights