Thrummingbird Thrummingbird is the classic proliferate bird
(You may cast this card from your graveyard for its escape cost.) Number 154 Language English Legal Formats Commander, Legacy, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Historic, Modern, Pauper, Pioneer, Standard, Timeless Rulings (10/13/2023) To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as an escape cost), add any cost increases, then apply any cost reductions
But you just countered their spell, which put them down a card and cost them mana, this is still likely worse for them than the other players who arent involved in the exchange at all
They can recognize that such decisions have an adverse effect on the game and the Magic intellectual property overall
This will mean a lot of beloved cards, and mechanical groupings will likely not make the final release, but that is the cost of having ones cake and eating it