Allazri, Brooder of Chaos

Allazri enters the battlefield with four +1/+1
counters on it.
If a spell or permanent would cause a triggered
ability to trigger, that ability triggers
an additional time.
When the stack has 10 or more spells/abilities for
the first time each turn, double the number of
+1/+1 counters on Allazri, then create X 1/1
green Hydra creature tokens, where X is the
number of +1/+1 counters on Allazri.