Ethelrod, Soul of the Tide

Vigilance
Mutate {4}
When Ethelrod, Soul of the Tide enters the
battlefield put a +3/+4 counter on any target.
Whenever Ethelrod, Soul of the Tide mutates,
destroy target blue creature with power 4 or less.
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"It breathes magical mist, which calms enemies
so it can strike. It's an intelligent creature, really."
— Syr Tavio, the Clever