Aid from the Cowl

Mana cost: {3}{G}{G}
Type: Enchantment
Set: Aether Revolt Promos #105s (rare)

Revolt — At the beginning of your end step, if a permanent left the battlefield under your control 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.

Aid from the Cowl has 3 printings, first in Aether Revolt (2017). EDHREC ranks it #11,205 among Commander cards. It appears most in Vaevictis Asmadi, the Dire decks (2,464 on EDHREC). 1 public deck on TCG runs it. It has 8 official rulings.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: not legal
modern: legal
pioneer: legal
standard: not legal
brawl: not legal

Public decks that run Aid from the Cowl

Tinker Time - March of the Machine Commander, led by Gimbal, Gremlin Prodigy

Commanders that run Aid from the Cowl most

Deck counts from EDHREC.

Often played with Aid from the Cowl

Cards that show up in the same decks on EDHREC.

Rulings

2017-02-09: A permanent card is an artifact, creature, enchantment, land, or planeswalker card.
2017-02-09: 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.
2017-02-09: Tokens that leave the battlefield will satisfy a revolt ability.
2017-02-09: 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.
2017-02-09: 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.
2017-02-09: 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.
2017-02-09: 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.
2017-02-09: Energy counters aren't permanents. Paying {E} won't satisfy a revolt ability.