Ivorytusk Fortress
Creature — Elephant
Untap each creature you control with a +1/+1 counter on it during each other player's untap step.
Abzan soldiers march to war confident that their Houses march with them.
Matt Stewart
Rulings
Each creature you control with a +1/+1 counter on it untaps at the same time as the active player’s permanents. You can’t choose to not untap them at that time.
(wotc • 2014-09-20)
Effects that state a creature you control doesn’t untap during your untap step won’t apply during another player’s untap step.
(wotc • 2014-09-20)
Controlling more than one Ivorytusk Fortress doesn’t allow you to untap any creature more than once during a single untap step.
(wotc • 2014-09-20)
Rulings
Each creature you control with a +1/+1 counter on it untaps at the same time as the active player’s permanents. You can’t choose to not untap them at that time.
(wotc • 2014-09-20)
Effects that state a creature you control doesn’t untap during your untap step won’t apply during another player’s untap step.
(wotc • 2014-09-20)
Controlling more than one Ivorytusk Fortress doesn’t allow you to untap any creature more than once during a single untap step.
(wotc • 2014-09-20)