User blog comment:Tommy Young/Tau, the Spell Stealer/@comment-89.75.167.175-20120726113939

The biggest problem with this champ would be on the programming/graphics side. Examples:

1) Graphical issues.

When Rammus uses powerball, he changes his look. When hecarim uses his AOE attack, his glaive (which Tau won't have) makes a circular move. When lee sin uses his Q or E, he makes specific animations. When Lux uses her W (shield), she throws her scepter (which, again, Tau won't have).

Would the devs have to design graphics all over again for most of the spells currently in game as well as those to come, so that Tau can use them and not look stupidly?

2) Mechanic issues.

How will the spell cost be calculated if you have mana and the spell is stolen from an energy using champion? Some spells, e.g. Shen's Taunt/Dash, are balanced around extreme Energy costs.

Or, how will it work if you steal a Heavenly Wave (Q) from a Karma, who has used a Mantra charge on it? Will you be able to cast 6 short-cooldown AOE healing nukes? Will killing something with a stolen Veigar Q give you permanent AP?

There are tons of such things that will give not only devs, but also players a real headache.