ザルファーの魔道士、テフェリー
伝説のクリーチャー — 人間・ウィザード
瞬速 （あなたはこの呪文を、あなたがインスタントをプレイできるときならいつでもプレイしてよい。）
あなたがオーナーである場に無いクリーチャー・カードは瞬速を持つ。
各対戦相手は、そのプレイヤーがソーサリーをプレイできるときにのみ呪文をプレイできる。
この次元を救うため、彼はそれ以外のすべての次元を捨てねばならない。
Illustrated by
Time Spiral#83RareJapaneseLegality
Rulings
If an effect allows an opponent to cast spells any time they could cast an instant (for example, if your opponent also controls Teferi), the restriction of Teferi's last ability takes precedence over that permission.
While you control Teferi, you may exile creature cards in your hand with suspend any time you could cast an instant.
If a spell on the stack has split second while you control Teferi, you can't suspend creature cards since split second stops you from casting them, even though suspending them is a special action.
If a spell or ability lets an opponent cast a spell as part of its effect (such as suspend and rebound do), that opponent can't cast that spell since the resolving ability is still on the stack. This is true even if the spell is an instant.
Teferi's last ability means that in order for an opponent to cast a spell, it must be that opponent's turn, during a main phase, and the stack must be empty. This is true even if a rule or effect allows a sorcery to be cast at another time.