This spell can't be countered.
Trample, ward {4}
Whenever Koma deals combat damage to a player, create four 3/3 blue Serpent creature tokens named Koma's Coil.
A spell or ability that counters spells can still target Koma. When that spell or ability resolves, Koma won't be countered, but any additional effects of the countering spell or ability will still happen.