Gladewind Berserker

Trample, haste
If Gladewind Berserker is blocked by any
creature with power 5 or greater, Gladewind
Berserker gains double strike until end of turn.
Pay 5 life: Regenerate Gladewind Berserker. If
Gladewind Berserker is regenerated this way, put
a +1/+1 counter on it.