Engineered Explosives [Fifth Dawn] 56 Then that player loses all

Then that player loses all unspent mana and you add the mana lost this way

Set: Core Set 2021 Type: Legendary Artifact Rarity: Mythic Cost: {7} You may spend mana as though it were mana of any color

where X is the number of Rats you control

"Know your foes' strengths as well as their weaknesses

{T}: Add {C}{C}{C}{C}{C}

Engineered Explosives [Fifth Dawn] 56 Then that player loses allSet: Fifth Dawn Type: Artifact Rarity: Rare Cost: {X} Sunburst (This enters the battlefield with a charge counter on it for each color of mana spent to cast it.) {2}, Sacrifice Engineered Explosives: Destroy each nonland permanent with mana value equal to the number of charge counters on Engineered Explosives.