Will the suspended cards pop out if Teferi, Mage of Zhalfir is in play on my opponent's side?
No, they will not. Teferi says "You can only cast spells when you could cast a sorcery." Suspend will try to play a spell during your upkeep, and Teferi will not allow it, so your spell will stay in exile.
EDIT: Even if you were somehow able to get Suspend to cast a spell outside of your upkeep, Teferi still would not allow it.
No, they will not. Teferi says "You can only cast spells when you could cast a sorcery." Suspend will try to play a spell during your upkeep, and Teferi will not allow it, so your spell will stay in exile.
EDIT: Even if you were somehow able to get Suspend to cast a spell outside of your upkeep, Teferi still would not allow it.
Draft my cube! (630 cards)