To proliferate means to choose any number of permanents and/or players that have a counter, then give each one additional counter of each kind that permanent or player already has
One said he could if he had two mana, so I Snapped his Birgi and untapped two of his lands, which let him use Tainted Pact to find Force of Will, incidentally exiling many important cards from his deck, and getting another card out of his hand to stop the other player from winning, which, in that spot, was far better for me than if Id been able to counter the Underworld Breach myself
Coming in quarter one of 2026 is Winterspell
Create a token that's a copy of target creature you control
MTG Final Fantasy is a full, major set
Each The Brothers' War Set Booster Box contains 30 The Brothers' War Set Booster Packs