A trade, technically: steal any one of your opponent's unused buffs, but the spell demands payment: your own lowest-tier unused card goes to them in exchange.
You draft Spelltheft in Buff mode. Activated: you choose when to use it, and using it is your move for that turn.
As a draft card, it bends one player's draft: the tier, the count, or the pool.
“Nice card. Mine now. Here, have this one.”