Aid from the Cowl

Revolt — At the beginning of your end step, if a permanent you controlled left the battlefield this turn, reveal the top card of your library. If it's a permanent card, you may put it onto the battlefield. Otherwise, you may put it on the bottom of your library.

March of the Machine Commander

Aether Revolt Promos

Aether Revolt

A permanent card is an artifact, creature, enchantment, land, or planeswalker card.

All cards in the Aether Revolt set with triggered revolt abilities use an intervening “if” clause. A permanent you controlled must have left the battlefield earlier in the turn in order for these abilities to trigger; otherwise they do nothing. In other words, there's no way to have the ability trigger if no permanent you controlled has left the battlefield that turn, even if you intend to have one do so in response to the triggered ability.

Energy counters aren't permanents. Paying {E} won't satisfy a revolt ability.

If a permanent put onto the battlefield this way has an ability that triggers at the beginning of your end step, it won't trigger during this end step.

If the revealed card is not a permanent card or if you choose not to put it onto the battlefield, you may put it on the bottom of your library. If you don't, it remains on top of your library.

Revolt abilities check only whether a permanent you controlled left the battlefield this turn or not. They don't apply multiple times if more than one permanent you controlled left the battlefield. They don't check whether the permanent that left the battlefield is still in the zone it moved to.

Revolt abilities don't care why the permanent left the battlefield, who caused it to move, or where it moved to. They're equally satisfied by an artifact you sacrificed to pay a cost, a creature you controlled that was destroyed by Murder, or an enchantment you returned to your hand with Leave in the Dust.