Press the Enemy

Bounce that pays you back. The tempo swing of returning a spell on the stack or a permanent to hand is the kind of effect blue has always priced at a premium; here either target feeds the same free-cast rider on a single instant. Returning a spell to hand is the sharper mode: it functions as a counter that leaves the answer in your opponent's hand rather than exiling or destroying it, but you profit from having spent your mana anyway. The free-cast rider is what elevates the card from decent to dangerous, and the mana-value cap is the mechanism that keeps it in check: whatever you bounce sets the ceiling on what you can cast for nothing, so answering a four-drop unlocks a four-drop of your own from hand, while fizzling a one-mana cantrip on the stack buys you little beyond the tempo. The design rewards patience over reflex; jamming this on the first legal target throws away the reason it costs four mana instead of two. The upside is a free spell where the second card is often a hard-hitting instant or sorcery you would otherwise be holding, cast off-curve and off-color-of-consequence. That the free spell must already be in your hand, and must respect the cap, is the discipline that stops it from spiraling: it is a reward for building a deck full of impactful spells, not a Mind's Desire that conjures value from nowhere.