Birgi, God of Storytelling // Harnfel, Horn of Bounty - [Foil] Kaldheim (KHM) V10 Other players can chose to

Other players can chose to help the player or hinder by adding extra monsters to the encounter

goblin tinkerer

gain control of target nonland permanent for as long as Giant's Grasp remains on the battlefield

up to one target player puts all the cards from their graveyard on the bottom of their library in a random order

Birgi, God of Storytelling // Harnfel, Horn of Bounty - [Foil] Kaldheim (KHM) V10 Other players can chose toWhenever you cast a spell, add {R}. Until end of turn, you don't lose this mana as steps and phases end. Creatures you control can boast twice during each of your turns rather than once. "This is a tale to make all Kaldheim tremble"