Lae'zel, Vlaakith's Champion | Jace, Cunning Castaway | Carth the Lion

Cards

Cast
Jace by paying ({1} magic symbol) ({U} magic symbol) ({U} magic symbol) .
Jace enters the battlefield with four loyalty counters due to
Lae'zel.
Activate
Jace's third loyalty ability by removing four loyalty counters from it.
Jace dies as a state-based action due to having zero loyalty.
Resolve the
Jace ability, creating two non-legendary copies of
Jace, which enter with four loyalty counters each due to
Lae'zel.
Repeat from step 3 using a
Jace token.
Once you have infinite
Jace tokens, you may activate their second loyalty abilities by removing two loyalty counters from them, creating infinite 2/2 Illusion creature tokens.