Rousing Refrain is a rare Sorcery card from Commander 2021 (C21), collector number 383. Current market price: $4.14, TCGplayer market prices via Scryfall.
Add {R} for each card in target opponent's hand. Until end of turn, you don't lose this mana as steps and phases end. Exile Rousing Refrain with three time counters on it. Suspend 3—{1}{R} (Rather than cast this card from your hand, you may pay {1}{R} and exile it with three time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost.)