The Angelicasta

This land enters the battlefield tapped. When this land enters, sacrifice it unless you tap three Astartes creatures you control. {T}: {B}, {R}, {G}, or {W}. {2}{B}{R}{G}{W}, {T}: Create two 2/2 Astartes Knight creature tokens named Dark Angel Knight with double strike and exalted. Dark Angels live here.{/fontsize-10}