Alito, Undefeated Gladiator

When Alito, Undefeated Gladiator enters the battlefield, put a +1/+1 counter on another Warrior Creature you control.
When Alito, Undefeated Gladiator dies, you
may pay {p/b}{p/b}{p/b}, if you do, transform Alito, Undefeated Gladiator.