Force of Negation [Modern Horizons] Ice Age Set: Duel Decks: Elves vs

Set: Duel Decks: Elves vs

Set: Aether Revolt Type: Artifact Creature — Construct Rarity: Rare Cost: {X}{X} Walking Ballista enters the battlefield with X +1/+1 counters on it

Set: Beta Edition Type: Artifact Rarity: Rare Cost: {0} {T}: Add {U}

then meld them into Brisela

But where is the source

Force of Negation [Modern Horizons] Ice Age Set: Duel Decks: Elves vsSet: Modern Horizons Type: Instant Rarity: Rare Cost: {1}{U}{U} If it's not your turn, you may exile a blue card from your hand rather than pay this spell's mana cost. Counter target noncreature spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard. "Try, if you must."