TEDDAI, the Unstable Construct

{2}, Sacrifice TEDDAI: TEDDAI deals 3 damage to any target.

Whenever an opponent discards a card, put a scrap counter on TEDDAI.
Remove three scrap counters from TEDDAI: Create a token that’s a copy of TEDDAI, except it’s not legendary.
At the beginning of your end step, if TEDDAI died this turn, you may exile an artifact card from your graveyard. If you do, return TEDDAI from your graveyard to the battlefield tapped.