Primordial Hydra enters the battlefield with X +1/+1 counters on it.
At the beginning of your upkeep, double the number of +1/+1 counters on Primordial Hydra.
Primordial Hydra has trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.) as long as it has ten or more +1/+1 counters on it.
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