Noz'Karin, Herald of the Deep

Elemental and Kraken Creatures you control gain
Flash and Convoke.
Each time an elemental or kraken creature enters
the battlefield, Noz'Karin gains a flood counter.
You can remove flood counters to perform one of
the following effects:
- Remove 2 counters then tap Noz'Karin, counter
target spell.
- Remove {x} counters, Destroy all creatures your opponent controls with converted mana cost equal
to or less than {x}.