Zariel, Archduke of Avernus

[+1]: Creatures you control get +1/+0 and gain haste until end of turn.
[0]: Create a 1/1 red Devil creature token with "When this creature dies, it deals 1 damage to any target."
[−6]: You get an emblem with "At the end of the first combat phase on your turn, untap target creature you control. After this phase, there is an additional combat phase."