Lannister, Tinkering Historian

First strike, Soulbond

Whenever Lannister, Tinkering Historian or a clue artifact enters the battlefield under your control, if you control 3
or more clues, you may create Slithers, a 4/4 Snake legendary artifact creature token

While Lannister, Tinkering Historian is paired with Slithers, Clues you control are 2/2 creatures with "when this creature dies, put a +1/+1 counter on another artifact creature token you control"