Whenever Thraximundar attacks, defending player sacrifices a creature of their choice.
Whenever a player sacrifices a creature, you may put a +1/+1 counter on Thraximundar.
Thraximundar is a Grixis voltron-aristocrats hybrid that grows huge while forcing opponents to sacrifice their best blockers. Ramp into the 6/6 haste body, swing to make a player sac a creature, then snowball counters off every sacrifice across the table. Backed by sacrifice synergies, reanimation, and removal, you grind the board down and convert his size into lethal commander damage.
Comes down with haste and immediately pressures life totals and boards
Built-in evasion-of-sorts: defenders must sacrifice a creature before blocking math
Snowballs +1/+1 counters off any sacrifice, including your own aristocrats effects
Grixis colors give access to the best removal, ramp, and reanimation
Seven mana and a creature-based plan make him vulnerable to wipes and spot removal
Commander tax makes repeated recasts punishing
No evasion natively — a single big blocker or fog can stall the attack
Sacrifice trigger lets opponents ditch tokens or worst creatures, blunting tempo