Enchantment - Saga The Shattered States Era (As this Saga enters and after your draw step, add a lore counter.) I Gain control of target creature until end of turn
They don't often run a lot of artifacts that are going to sit around and not be tapped, and Soldiers in Standard is almost exclusively Mono-White, and only sometimes splashes Blue, so I don't think he's going to find his way in there
Friends on the Other Side, Let The Storm Rage On, and Strength of a Raging Fire all fit great and can be used in lots of other decks
Once you wound your opponent, they can often just chump block to avoid taking damage
Other good signs in my experience are subjects against large flat backgrounds, distinct highlights, and two-tone color profiles
If you've completed the story, other creatures you control get +1/+1