Unlike Drain Samba, the MP drained from this ability is actually lost by the target in addition to the normal damage done by an attack, whereas Drain Samba functions by absorbing HP from the damage already done (without doing any additional damage to the target)
Drains 1-8 MP per regular melee strike; one-handed weapons drain 1 to 4 per hit, two-handed weapons drain 3 to 7 (and rarely 8) per hit.
Weapon delay along with the amount of damage done per hit will affect Aspir Samba much like it affects Drain Samba.
Target level will also affect how often you "cap" out the drained amount.
As with all other "draining" effects, Aspir Samba is ineffective against undead foes. However, draining Sambas are not considered to be of a dark-element like other draining effects, and can still be effective against dark-resistant targets.