Tyrant of the Kratal River

{2}{g}: Tyrant of the Kratal River gets +1/+1 until
end of turn, then it fights with target creature
you don't control.
Put a +1/+1 counter on Tyrant of the Kratal
River at the end of each combat phase.
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He doesn't hunt: he simply waits for the corpses to
flood his river, killing any opposing predator.