ThraximundarHow it works & interactions with other cards

Unpacking the Abilities

Thraximundar features three distinct abilities: Haste, an attack trigger, and a triggered growth ability. The most important interaction is between the second and third abilities. When Thraximundar attacks, it forces the defending player to sacrifice a creature; because this sacrifice occurs, Thraximundar's third ability immediately triggers, allowing you to put a +1/+1 counter on it before blocks are even declared.

The Timing of the Sacrifice

The sacrifice trigger happens during the Declare Attackers step. This is crucial because it occurs before the Declare Blockers step. If the defending player only has one creature, they must sacrifice it, leaving them with no blockers for Thraximundar. Furthermore, the growth ability triggers whenever ANY player sacrifices a creature for ANY reason—including you sacrificing your own permanents to other spells or abilities.

Common Pitfalls

A common mistake is assuming Thraximundar must be the cause of the sacrifice to get a counter. In reality, if an opponent sacrifices a creature to pay a cost for one of their own spells, Thraximundar still gets a counter. Also, remember that Thraximundar's sacrifice ability targets the 'defending player,' not the creature itself, meaning it bypasses keywords like Hexproof or Protection.

Strategic Deployment

Because Thraximundar costs seven mana, you want to ensure it impacts the board immediately. Thanks to Haste, it can attack the same turn it is cast. It is best played when you can protect it or when an opponent's board state is thin enough that a single sacrifice removes their only viable blocker.

Interaction examples

Aggressive Sequencing

Etali, Primal Storm

If you control both creatures and attack with them, both triggers go on the stack. You can resolve Etali, Primal Storm first to potentially cast more spells from libraries. Then, Thraximundar's trigger forces the defender to sacrifice a creature. If that sacrifice happens, Thraximundar's third ability triggers, and it grows to a 7/7 before the opponent can even choose blockers for either creature.

Navigating the Stack

Hullbreaker Horror

Suppose you attack with Thraximundar and your opponent attempts to cast a removal spell in response to the sacrifice trigger. If you then flash in Hullbreaker Horror, you can use its trigger to return that spell to their hand. After the Horror resolves, the original Thraximundar trigger finishes, forcing a sacrifice and making Thraximundar even larger to survive future combats.