Vigilance (Attacking doesn't cause this creature to tap.), trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.), haste (This creature can attack, and as soon as it comes under your control.)
Goldvein Hydra enters the battlefield with X +1/+1 counters on it.
When Goldvein Hydra dies, create a number of tapped Treasure tokens (A Treasure is an artifact with ", Sacrifice this artifact: Add one mana of any color.") equal to its power.
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