Thavne, the Searing Viper

Menace
Whenever Thavne, Searing Viper enters the battlefield, create two black 1/1 Imp creature
tokens with Haste.
Sacrifice another creature you control and
Thavne, Searing Viper deals 2 damage to target creature your opponent controls. The controller
of that creature may counter this effect by discarding two cards isntead.