Kiki-Jiki, Mirror Breaker | Auton Soldier

(and one other card)

Effects that Alter a Creature's Power/Toughness (Anthem Effects)

Activate
Kiki-Jiki by tapping it, creating a token copy of
Auton Soldier that has haste. Choose to have
Auton Soldier enter as a copy of
Kiki-Jiki.
Put the oldest
Kiki-Jiki into the graveyard due to the legend rule.
Repeat step 1 using the
Auton Soldier token instead.
Activate
Auton Soldier by tapping it, creating a token copy of itself with haste that will be sacrificed at the next end step.
The
Auton Soldier token enters the battlefield as a nonlegendary copy of
Kiki-Jiki with an additional +1/+1 counter.
Activate the
Auton Soldier token by tapping it, creating a token copy of itself with haste, exile that token at the end of turn.
Repeat from step 2.