Jax, Twilight Explorer

First strike, haste
Whenever Jax, Twilight Explorer or another
Centaur enters the battlefield under your control, reveal the top card of your library. If it's a land
card, put it onto the battlefield. Otherwise, put it
into your hand.
At the beginning of your end step, you may pay {2}. If you do, create a 3/3 green Centaur
creature token.