Magic The Gathering Cards of types 'Artifact' and 'Hydra'

This creature enters with four +1/+1 counters on it. Whenever this creature attacks or blocks, remove a +1/+1 counter from it. If you do, it deals 1 damage to any target. {T}: Put a +1/+1 counter on this creature.

Indestructible Darksteel Hydra enters with X oil counters on it. Darksteel Hydra's power and toughness are each equal to twice the number of oil counters on it. When Darksteel Hydra enters, conjure a card named Darksteel Ingot and a card named Darksteel Plate into your hand.