Code of Constraint

Instant    (CMC:3)

Target creature gets -4/-0 until end of turn. Draw a card. Addendum — If you cast this spell during your main phase, tap that creature and it doesn't untap during its controller's next untap step.

035 RNA • ENEkaterina Burmak — watermark: Azorius

™ & © 1993— Wizards of the Coast

Notes: TODO: Update Copyright

Legal in: Pioneer,Modern,Legacy,Vintage,Commander

Oracle Text (click to copy):

Code of Constraint {2}{U} Instant Target creature gets -4/-0 until end of turn. Draw a card. Addendum — If you cast this spell during your main phase, tap that creature and it doesn't untap during its controller's next untap step.

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View this MTG card on Gatherer

1/25/2019
If the target creature is an illegal target by the time Code of Constraint tries to resolve, the spell doesn’t resolve. You don’t draw a card.
1/25/2019
Code of Constraint can target a creature that’s already tapped. If you cast it during your main phase, that creature won’t untap during its controller’s next untap step.
1/25/2019
Addendum abilities of instant spells apply while the spell is resolving, not immediately after casting it. If the spell is countered, you don’t get the addendum bonus. For example, if you cast Sphinx’s Insight during your main phase, you gain 2 life during its resolution, after you draw two cards.
1/25/2019
If a spell with an addendum ability is copied, the copy won’t give you the addendum bonus. This is because the copy wasn’t cast at all.

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Card Code of Constraint is not on TCGPlayer.