Thermal BlastHow it works & interactions with other cards

Understanding the Damage Output

Thermal Blast is a targeted removal spell that deals damage to a single creature. The amount of damage it deals is determined entirely by the number of cards in your graveyard at the moment the spell resolves. If you have six or fewer cards, it deals 3 damage; if you have seven or more, it deals 5 damage.

How Resolution Works

When you cast Thermal Blast, you choose a target creature and pay the mana cost. The spell is placed on the stack. The Threshold check does not happen until the spell begins to resolve. Even if you only had six cards in your graveyard when you cast it, if an effect puts a seventh card there before Thermal Blast resolves, it will deal the full 5 damage.

Common Pitfalls

A common mistake is forgetting that Thermal Blast itself is not in the graveyard while it is resolving. The spell is currently on the stack, so it cannot count toward its own Threshold requirement. You must have seven other cards already present in the graveyard to trigger the 5-damage version of the effect.

When to Use It

Thermal Blast is best used in decks that can quickly fill the graveyard. In the early game, use it to pick off small aggressive creatures. In the mid-to-late game, leverage discard outlets or sacrifice effects to reach Threshold, turning this into a high-impact removal spell capable of destroying creatures with high toughness.

Interaction examples

Reaching Threshold via Discard

Big Score

If you have 5 cards in your graveyard and cast Big Score, you must discard a card as an additional cost. That discarded card immediately goes to the graveyard, bringing your total to 6. Once Big Score resolves and goes to the graveyard, you now have 7 cards. A subsequent Thermal Blast will now deal 5 damage instead of 3.

Stacking for Success

Unexpected Windfall

Imagine you have 6 cards in your graveyard and cast Thermal Blast. Your opponent tries to save their creature, so you respond by casting Unexpected Windfall. Because Unexpected Windfall requires a discard and then resolves before Thermal Blast, it adds at least two cards to your graveyard (the discard and the spell itself). When Thermal Blast finally resolves, it sees 8 cards and deals 5 damage.