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 : 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 : 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.

2020-08-07 : The target opponent can't activate any abilities, including mana abilities.

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 : You can't activate abilities of cards in the target opponent's hand.