Encantamiento
En cuanto este encantamiento entre, elige Abzan o Mardu.
• Abzan — Al comienzo de tu paso final, pon un contador +1/+1 sobre cada criatura que controlas.
• Mardu — Al comienzo de tu paso final, si una criatura murió bajo tu control este turno, cada oponente sacrifica una criatura de su elección.
If you somehow control Barrensteppe Siege and no choice was made for it (perhaps because another permanent on the battlefield became a copy of it), it has neither of the two abilities.
Barrensteppe Siege’s Mardu ability will check as the end step starts to see if a creature died under your control this turn. If none did, the ability won’t trigger at all.