You have a way to cause a creature to enter the battlefield under your control.
Steps
Cause a creature to enter the battlefield under your control.
Healer of the Pride triggers, holding priority, activate Prize Pig by tapping it, adding ({1} magic symbol) .
Leyline of Abundance triggers, adding ({G} magic symbol) .
Resolve the Healer of the Pride trigger, causing you to gain 3 life due to Bilbo.
Prize Pig and Trudge Garden trigger.
Resolve the Prize Pig trigger, putting three ribbon counters of Prize Pig, then removing all ribbon counters from Prize Pig and untapping it.
Resolve the Trudge Garden trigger, causing you to pay ({2} magic symbol) to create a 4/4 Fungus Beast creature token.
Repeat from step 2.
Once you have infinite life, you may activate Bilbo's ability if it doesn't have summoning sickness to put all creature cards from your library onto the battlefield.
Results
Infinite creature tokens.
Infinite ETB.
Infinite lifegain.
Infinite lifegain triggers.
Put all creatures cards from your library onto the battlefield.