Coercion

The standard-bearer for targeted discard that lets the caster do the choosing. Where a random discard outsources the decision to chance, this hands the attacker the whole hand and the pick: you see what the opponent is holding, and you take the card that hurts them most. That information component is the real cost-justifier; the three-mana sorcery rate looks unremarkable until you count that it doubles as a scouting report, telling you what threats remain and what answers you still have to play around. The lineage runs straight back to Hymn to Tourach (two-for-one but random) and forward to Thoughtseize and Inquisition of Kozilek, which cut the body of the effect down to a single black mana by trimming the targets it can hit. Coercion is the no-restriction version: any card, any time you can cast a sorcery, with the only friction being the full three mana and the fact that it does nothing once the opponent's hand is empty. That sorcery-speed limitation is the load-bearing constraint; this is a proactive play, not a reactive one, so it wants to land before the opponent has committed their hand to the board rather than after. It reads as a plain effect because the plainness is the point: the design question discard cards have circled ever since is how cheap you can make "take their best card" before it stops being fair.