Jace enters the battlefield with four loyalty counters due to Lae'zel.
Activate Jace's first loyalty ability by putting two loyalty counters on it, causing you to loot whenever you deal combat damage to a player this turn.
Activate Jace's third loyalty ability by removing five loyalty counters from it, 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.