Derkin, The Singing Kobold

When Derkin, The Singing Kobold enters the battlefield,
all creatures under your control gain +1/+1
as long as Derkin is on the battlefield.
As long as Emisil, The Valkyrie of Aethia or Carlotta,
The Golden Lyre are on the battlefield,
Derkin is indestructible.
{t}: Gain 5 life.
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"Please, no hurt Derkin!"