Felidar of the Tides

At the beginning of your upkeep, put a tide
counter on Felidar of the Tides.
As long as Felidar of the Tides has an even
number of tide counters on it, it has vigilance, lifelink, hexproof, and "At the beginning of your
end step, you gain 2 life" (Zero is even).
As long as Felidar of the Tides has an odd number
of tide counters on it, it has "At the beginning
of your end step, you lose half your life total,
rounded down. Then, Felidar of the Tides deals
that much damage to target cr