Poseidon, god of water

At the end of each of your upkeeps add or remove a wave counter to or from Poseidon, god of water to a minimum of one and a maximum of three
If Poseidon, god of water has one wave counter it gains +4/+7 and reach
If Poseidon, god of water has two wave counters it gains +6/+5 and vigilance
If Poseidon, god of water has three wave counters it gains +8/+3 and first strike