Stardrop Hydra

Trample, vigilance, lifelink
Stardrop Hydra enters the battlefield with a +1/+1 counter on it.
Whenever you cast a spell with mana value equal to the number of +1/+1 counters on Stardrop Hydra, put a +1/+1 counter on Stardrop Hydra.
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"As the god's essence overwhelmed the world, ancient beings arose to consume it."