Overwhelm

A go-wide deck's central frustration is that its widest board arrives on the turn its mana is most stretched, and this finisher is built precisely around that mismatch. The +3/+3 across the team is enormous, swinging a stalled token swarm into lethal in a single attack step, but at seven mana the printed cost would make it a clumsy topdeck in the exact deck that wants it. Convoke collapses the price: tap the bodies you were going to hold back anyway (chump blockers, mana dorks, creatures with summoning sickness, anything not part of the alpha strike), and the spell can resolve for almost no actual lands while still buffing the whole army. Because it is a sorcery, sequencing is the skill it asks for: cast it in your main phase, then attack with whatever you did not tap to pay, so the sharp play is to convoke with creatures that were never going to swing and let the rest connect for far more. It is a finisher that scales with the very resource it spends. Earlier overruns asked you to pay full freight for the alpha strike; this one asks only that you have the creatures, which a token deck has by definition, and then turns the surplus bodies into the spell that ends the game with them.