Trouble in Pairs [Murders at Karlov Manor Commander] SV1 Whenever you cast an instant

Whenever you cast an instant or sorcery spell that targets a creature you control

As Morophon

you may search your library for an Assembly-Worker creature card

Son of Yawgmoth

Pay 1 life: Exile the top card of your library

Trouble in Pairs [Murders at Karlov Manor Commander] SV1 Whenever you cast an instantSet: Murders at Karlov Manor Commander Type: Enchantment Rarity: Rare Cost: {2}{W}{W} If an opponent would begin an extra turn, that player skips that turn instead. Whenever an opponent attacks you with two or more creatures, draws their second card each turn, or casts their second spell each turn, you draw a card. Together, they're greater than the sum of their rap sheets.