As RxPhantom pointed out Eerie Interlude and also Ghostway to protect your creatures. When combined with Eternal Witness you can get them back on the ETB trigger each times, so you can do it indefinitely. This is my favorite thing to do in a Selesnya deck. If you wanted to go a bit deeper then Greenwarden of Murasa or Skullwinder for the ETB effect.
Niv-Mizzet Reborn
Feather, the Redeemed
Estrid, the Masked
Teshar
Tymna/Ravos
Najeela, Blade-Blossom
Firesong & Sunspeaker
Zur the Enchanter
Lazav, the Multifarious
Ishai+Reyhan
Click images for decks->
-Prime Speaker Vannifar
---------------------Will & Rowan Kenrith