Quandrix Command
Instant
Choose two —
• Return target creature or planeswalker to its owner's hand.
• Counter target artifact or enchantment spell.
• Put two +1/+1 counters on target creature.
• Target player shuffles up to three target cards from their graveyard into their library.
Illustrated by
The Lost Caverns of Ixalan Commander#280RareEnglishLegality
Rulings
Apr 16, 2021
As Quandrix Command tries to resolve, if the fourth mode is chosen and all of the target cards are illegal, but the target player is still legal, that player will still shuffle their library.
Apr 16, 2021
If at least one target is still legal as Quandrix Command tries to resolve, it will resolve and do as much as it can.
Apr 16, 2021
If all of Quandrix Command's targets are illegal as it tries to resolve, it will do nothing.