Echidna, Tribal Conqueror

Trample, riot, annihilator 1
When Echidna, Tribal Conqueror enters the
battlefield, you may have your life total become
your starting life total. If you do not, China
fights up to one target creature.
Exile Echidna, Tribal Conqueror from your
graveyard: your life total becomes half your
starting life total, rounded up.