Azkem, Kaladesh Menace

Haste
When Azkem, Kaladesh Menace enters the battlefield, add {b}{b}{b}.
{x}, {t}: Put a menacing counter on up to X creatures you control. They gain menace.
Ignite—At the beginning of your upkeep, if
you control 5 creatures with a menacing counter on it, transform Azkem, Kaladesh Menace.