Hydra Ferrovore

Trample, Smelt 5 (When this creature enters the battlefield, you may sacrifice up to 5 artifacts.)
Whenever Hydra Ferrovore smelts an artifact,
put a number of +1/+1 counters on it equal to
that artifact's converted mana cost.
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Goblins bring the hydra their scrap for snacks,
lest they become snacks themselves.