Hungering Hydra (M19) from Core Set 2019, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Daarken
• Card Text:
  Hungering Hydra enters the battlefield with X +1/+1 counters on it.
  Hungering Hydra can't be blocked by more than one creature.
  Whenever Hungering Hydra is dealt damage, put that many +1/+1 counters on it. (It must survive the damage to get the counters.)