Improvisation Capstone [Secrets of Strixhaven] Commander's Arsenal you may choose both

you may choose both

double the number of +1/+1 counters on that creature instead

sacrifice it

you create a 2/2 black Zombie creature token unless that player sacrifices a creature

They found something far greater

Improvisation Capstone [Secrets of Strixhaven] Commander's Arsenal you may choose bothSet: Secrets of Strixhaven Type: Sorcery Lesson Rarity: Mythic Cost: {5}{R}{R} Exile cards from the top of your library until you exile cards with total mana value 4 or greater. You may cast any number of spells from among them without paying their mana costs. Paradigm (Then exile this spell. After you first resolve a spell with this name, you may cast a copy of it from exile without paying its mana cost at the beginning of each of your first main