Here's a list of things that F-Len's 214a can reflect
All of Ciel's black keys including ex versions and the charged version
All of Hisui's stuffu
F-WLen's 236 series, including ex version
F-Warachia's 236 series, including air and ex versions
H-Aoko's 214 series, including ex version
F-Aoko's 236 series, including ex version
C-Nero's 236 and 623 series, not including ex versions
H-Nero's 236, series not including ex versions
F-Nero's 236, series not including ex versions
F-Mech Hisui's 214 series, including ex versions. Her 236C also get's reflected (Dunno why, but it just looks so funny whenever I see that get reflected)
H-Mech Hisui's 236 series, including ex version
F-Len's 236 series, including ex version
Kohaku's 2222c in F and C mode
Kohaku's 22222c in F and C mode (My god so many 2's)
All of Warc's blood rings, including air and ex version. Also, LOOOL FUCK YOU GEASS RING I REFLECT YO ASS
That's all I got, let me know if you guys find anymore
Edit: Apparently you can reflect F-Kohaku's 5[C] as well, BUT DON'T DO IT! IT'S A FREE FULL SCREEN UNBLOCKABLE
Here's a video
http://www.youtube.com/watch?v=wTY8vKtEp1EEdit2: It's actually full screen guyz
http://www.youtube.com/watch?v=hTTBfDVoAScEDIT: Only 214a can reflect the above