Spellthief's Edge feels bad.
Both
and
are items that don't require proactiveness or initiative relating to interaction with enemy Champions, and require significantly less risk to charge than
does.
requires you to put yourself in constant danger of death in order to charge it, it requires you to be proactive, and quest completion gets pushed back by 10+ minutes if you're losing your lane. On top of all this, it gives less gold. I feel compelled to always buy
because I play harassing Supports, but this item frankly feels unequal to its counterparts.