If one or more +1/+1 counters would be put on an Army, Goblin, or Orc you control, that many plus one +1/+1 counters are put on it instead.
Mauhúr turns every +1/+1 counter into a bigger swing on your Armies, Goblins, and Orcs, snowballing a single Amass Army token or a counter-laden Orc into a lethal threat with menace and evasion support. Curve out cheap counter-payoffs, repeatedly Amass to grow one massive Army, then close fast with trample/menace and counter-doubling effects. Aggressive midrange that wants to deploy and beat down before the table stabilizes.
Cheap two-mana commander that immediately accelerates any counter strategy
Amass synergy lets you funnel all growth into one resilient threat
Menace plus counters makes Voltron-style kills hard to chump-block
Strong in the underexplored Orc/Amass tribal space with low buy-in
Heavily commander-dependent; without Mauhúr the counter engine is mediocre
Vulnerable to board wipes and single-target removal on your one big creature
No card advantage or ramp built in—can run out of gas
Counter doublers don't stack additively in a runaway way, so growth can be slow without enablers