Sen Triplets
Double Masters — Mythic
Legendary Artifact Creature — Human Wizard
Sen Triplets rulings:
2020-08-07: The target opponent can't activate any abilities, including mana abilities.
2020-08-07: Activated abilities are written in the form “[Cost]: [Effect].” Some keyword abilities (such as cycling) are activated abilities and will have colons in their reminder texts.
2020-08-07: Triggered abilities use the word “when,” “whenever,” or “at.” They're often written as “[Trigger condition], [effect].” Triggered abilities are unaffected by Sen Triplets.
2020-08-07: Abilities that create replacement effects, such as a permanent entering the battlefield tapped or with counters on it, are unaffected by Sen Triplets. Abilities that apply “as [this creature] enters the battlefield” are also replacement effects and are unaffected.
2020-08-07: You can't activate abilities of cards in the target opponent's hand.
2020-08-07: Sen Triplets doesn't allow you to play more than one land during your turn or change when you may cast spells from the target opponent's hand.