We Say Thee Nay!

Teamwork resolves the oldest tension in Force Spike-style soft counters: the tax is only relevant early, and it stops mattering the moment your opponent untaps into open mana. This one lets you scale the tax by spending board presence you were not going to attack with anyway. Tap two power's worth of creatures on the cast, and the floor becomes a floor, which is the difference between a stumble and a hard wall in the midgame. That is the real design idea: a soft counter with a lever, where the cost you pay is measured in power on the battlefield rather than more mana in hand. The catch is that the lever pulls against the archetypes most likely to want a cheap counterspell. A tap-out control shell rarely has spare creatures standing around; a tempo deck full of small bodies does, but it would rather be attacking with them than holding them back to fuel a maybe-counter. Teamwork rewards a board that is wide and idle at once, a narrower window than the flexible payment structure suggests. Left ungrown, it is a two-mana counter that trails Mana Leak on rate; grown, it asks your opponent for a payment most decks cannot afford in the window where it lands. The card lives entirely in the gap between those two lines.