Sabertooth Whisperer

When Sabertooth Whisperer enters the battlefield sacrifice it, unless you sacrifice another creature.
Whenever you enter your battlephase you may pay{b/g}, if you do, tap Sabertooth Whisperer and create
a 12/12 Legendary Sabertooth Killer Creature
Token with "this creature fights every creature on
the battlefield apart from Sabertooth Whisperer,
if it can't, it deals 6 damage to any target and gets tapped".
At the beginning of your 2nd main phase sacrifice Sabertooth Killer