Jekk, Mercenary Hunter

Whenever Jekk, Mercenary Hunter deals damage
to an opponent, create a clue token.
When Jekk enters the battlefield, you may pay {1} and discard a card. If a land card is discarded
this way, Jekk gains "Double all damage dealt by
this creature." Then, if the cost was paid, Jekk
deals 2 damage to each of up to two targets.