Nyxborn Hydra — Modern Horizons 3 #164

Bestow (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached.)

Reach, trample

This permanent enters with X +1/+1 counters on it.

Enchanted creature gets +1/+1 for each +1/+1 counter on this Aura and has reach and trample.