Hakkar, the heresy of Ixalan

Flying, Trample, Menace.
They Shall Serve Other Dinosaur creatures you control, have persist.
The Prophesied Doom {b}{r}{10}: Exile Hakkar
with nine doom counters on it. At the endstep of
each player's turn, remove a doom counter from
Hakkar. When Hakkar has no doom counters on
it, return him to play. When Hakkar enters play
this way, every player looses the game.