Phantom Interference

The single-blue counterspell has always lived on the tension between cost and dead-draw risk: hold up Mana Leak against an aggro deck and you have a card that does nothing to the board. Spree resolves that tension by letting the same card choose which problem it wants to be. Pay the base cost plus one mana and it becomes a soft counter in the Mana Leak family; pay three more and it stops being reactive at all, dropping a flying blocker that pressures planeswalkers and trades into the exact aggressive starts a naked counterspell whiffs against. Do both and you have caught a spell and left a body behind, though the total outlay pushes it well past the tempo curve where cheap permission usually operates. What makes the design sharp is that neither mode is a bonus tacked onto the other: the token mode gives blue an instant-speed play when the opponent is empty-handed, and the counter mode gives it a use when they are not, so the card carries its own answer to the question every one-mana counterspell eventually faces. The counter half is deliberately soft (a tax, not a hard stop), which keeps the flexible mode from also being unconditional, and the flexibility is paid for honestly in mana every time you reach for more than one line.