Infinite copies of most creatures you control with hasteInfinite creature tokens with hasteInfinite death triggersInfinite creature ETBInfinite lifegainInfinite lifegain triggersInfinite creature LTBInfinite creature sacrifice triggers
How it works
Activate Lurking Roper using Kiki-Jiki's ability by tapping it, creating a token copy of itself with haste.
When the Lurking Roper token enters the battlefield, Trostani triggers, causing you to gain life equal to Lurking Roper's toughness.
Each Lurking Roper you control triggers, untapping themselves.
Repeat.
You may also target any nonlegendary creature you control.