Dawnstruck Arsenist

Indestructible
Whenever a creature card with power and
toughness of 4 or more enters the battlefield
under your control, sacrifice another creature
card you control. If you do, your opponent loses
1 life and you gain 1 life and your opponent mills
the top 4 and bottom 4 cards of there library.
{2}{r}: Create a 3/1 Fire Elemental creature token
with haste and vigilance.