To save this plane, he must forsake all others.

Teferi, Mage of Zhalfir

Flash
Creature cards you own that aren't on the battlefield have flash.
Each opponent can cast spells only any time they could cast a sorcery.

The List

Time Spiral Remastered

Iconic Masters

Flash
Creature cards you own that aren't on the battlefield have flash.
Each opponent can cast spells only any time he or she could cast a sorcery.

From the Vault: Legends

Time Spiral

Flash (You may play this spell any time you could play an instant.)
Creature cards you own that aren't in play have flash.
Each opponent can play spells only any time he or she could play a sorcery.

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.

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.

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.

While you control Teferi, you may exile creature cards in your hand with suspend any time you could cast an instant.