Lex Luthor II
If you anti-air or air-to-air an opponent high enough with d2 or jump 2, you can do a full b+3 combo. Much more consistent than trying to hit the b3 link from DB2 MB. May be hard to confirm on good players who rarely jump on cue, but against like low-level players who can't resist jumping at a range you KNOW you can read, go nuts. Like SF4 Bison j.MP combos, except more fun.
The b3 link from DB2 MB is some nice damage, but I personally wouldn't try it in a real match. Maybe in casuals if I was winning handily, but in a tense tourney match I wouldn't want to risk the damage lost (and possible punishment/loss of momentum) for messing up. Aquaman does enough damage from his easier 1-bar BnBs anyway; he's not a nuking character and he doesn't need to be.