Kogla and Yidaro
Legendary Creature — Ape Dinosaur Turtle
When Kogla and Yidaro enters, choose one —
• It gains [[ keyword: "trample" ]] and [[ keyword: "haste" ]] until end of turn.
• It fights target creature you don't control.
, Discard this card: Destroy up to one target artifact or enchantment. Shuffle this card into your library from your graveyard, then draw a card.
Chris Rahn
March of the Machine (MOM)
• #244Rulings
You don't have to choose a target artifact or enchantment for the last ability. However, if you do, and that permanent is an illegal target at the time the ability tries to resolve, the ability won't resolve and none of its effects will happen. You won't shuffle Kogla and Yidaro into your library and you won't draw a card.
(wotc • 2023-04-14)
Rulings
You don't have to choose a target artifact or enchantment for the last ability. However, if you do, and that permanent is an illegal target at the time the ability tries to resolve, the ability won't resolve and none of its effects will happen. You won't shuffle Kogla and Yidaro into your library and you won't draw a card.
(wotc • 2023-04-14)