When Chicken Troupe enters the battlefield, it triggers, causing you to get ({TK} magic symbol) and putting a name sticker on Well Rested.
Activate Yenna targeting the Well Rested with a name sticker by paying ({2} magic symbol) and tapping it, creating a copy of it named Well Rested attached to any creature, untapping Yenna, and scrying 2.
Each copy of Well Rested attached to Yenna triggers, each one putting two +1/+1 counters on Yenna and causing you to gain 2 life and draw a card.
Activate Yenna using Cryptic Trilobite's ability by removing a +1/+1 counter from it, adding ({C} magic symbol) ({C} magic symbol) .
Repeat from step 3.
Results
Infinite card draw.
Near-infinite lifegain.
Near-infinite lifegain triggers.
Infinite draw triggers.
Near-infinite scry.
Near-infinite colorless mana that can only be spent to activate abilities.