Ryoko, Sanguine Berserker

Trample, menace, Indestructible
When Ryoko enters the battlefield put five blood counters on her
If Ryoko would take damage remove
a blood counter instead
If Ryoko has no blood counters sacrifice her
Sacrifice two blood tokens: put a blood counter
on Ryoko
Remove two blood counters: Ryoko gets +1/+1 in
till end of turn for each blood counter on her