Lyric the Last Ancient (Sonic Boom) takes on a standard Sentinel.
Scenario A) Lyric vs. Original Standard Comic Sentinel.
Scenario B) Lyric takes on the standard Sentinels from the X-Men: Days of Future Past film.
Scenario C) Lyric takes on a future Sentinel from the X-Men: Days of Future Past film. As backup, Lyric will be allowed his robots.
EDIT: After watching a video of Sonic Boom where Sonic is facing off against Lyric, it turns out that Lyric is smaller than I thought, so for all these scenarios, Lyric is allowed back up from his robots.