Poke safely depends on your own skill but:
Ahri, Azir, Brand, Karma, Kat, Kennen, Lissandra, Lux, Malz, Morg, Orianna, Ryze, Swain, Syndra, Veigar, Vel'koz, Xerath, Ziggs, Zilean and Zyra.
Not saying they'll all perfectly safety poke the same and I'm definitely not saying all of them are good atm (Like some may be underpowered) but these champs do have ways to poke without taking trade back if you put in practice for it and still relevant for teamfights.
If I were to say which I would go for right now it'd be Ahri, Azir, Brand, Ken, Lux, Malz, Morg, Ryze, Veigar, Zilean. Maybe Syndra, Xerath, and ziggs too.