When Kogla and Yidaro enters, choose one —
• It gains trample and haste until end of turn.
• It fights target creature you don’t control. , Discard Kogla and Yidaro: Destroy up to one target artifact or enchantment. Shuffle Kogla and Yidaro into your library from your graveyard, then draw a card.
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.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.