I played many solo games since patch, but I have never seen Timewarped Leapfrogger neither in my choices, nor on opponents board.
I always try to stack beasts with deathrattles before first Timewarp - but no luck. I hold only beasts too - no luck. The only things I am always suggested are the Hyena, Boar (that need to die 3 times), a beast that gives tavern spell when dies, a Cat, that summon a cat and Saurlisk few times. Everytime the same choices but no Leapfroggers.
Maybe they are banned in low PTS lobbies?