Black_Heretic
Smash Lord
From MK's frame data thread:
You're thinking of Marth's =]GROUNDED SHUTTLE LOOP
frame breakdown:
1-7 startup
5-8 invincibility frames
8-13 strong hitbox out
14-21
22-31 weak hitbox out
frame summary:
Hits on frame: 8
IASA frame: 32
AERIAL SHUTTLE LOOP
frame breakdown:
1-7 startup
8-14 strong hitbox out
15-36 weak hitbox out
frame summary:
hits on frame: 8
IASA frame: 38