I just want to make sure the following 2 things work as expected.
1. I control a Gerrard, Weatherlight Hero and a Gadrak, the Crown-Scourge. My opponent controls 5 creatures. I cast Wrath of God and all 7 creatures go to the graveyard. Gerrard gets exiled, but Gadrak comes back. So 7 creatures have died this turn. Gadrak will make 7 treasures at the end of the turn, right? It doesn't matter that he was not continuously in play throughout the entire turn, right?
2. I control a Gerrard, Weatherlight Hero and an Aetherworks Marvel. I cast an Hour of Revelation. Gerrard dies, is exiled and Aetherworks comes back. Will I get the 2 energy counters from Gerrard and Aetherworks? Does Aetherworks "see" both itself and Gerrard hit the graveyard?
1) yes - his ability triggers at the end of your turn, so it doesn’t matter if you controlled him the whole time or not, as long as you control him when the trigger happens.
2) yes. AW gives you the energy counters when everything leaves play, including itself
1. Correct, assuming all the creatures involved in this scenario aren't tokens. Gadrak's last ability counts all "nontoken creature[s] that died this turn", even those that died "this turn" before Gadrak entered the battlefield (review C.R. 700.4). See also this thread.
2. Yes, assuming Gerrard and Aetherworks Marvel aren't tokens. Aetherworks Marvel's first ability will trigger whenever "a permanent you control is put into a graveyard", including Aetherworks Marvel itself or a "permanent you control" that goes to the graveyard at the same time as Aetherworks Marvel. This is because that ability is a leaves-the-battlefield ability that looks at the state of the game just before the trigger event it cares about (C.R. 603.6c, 603.10, 603.10a). See also this thread.
1. I control a Gerrard, Weatherlight Hero and a Gadrak, the Crown-Scourge. My opponent controls 5 creatures. I cast Wrath of God and all 7 creatures go to the graveyard. Gerrard gets exiled, but Gadrak comes back. So 7 creatures have died this turn. Gadrak will make 7 treasures at the end of the turn, right? It doesn't matter that he was not continuously in play throughout the entire turn, right?
2. I control a Gerrard, Weatherlight Hero and an Aetherworks Marvel. I cast an Hour of Revelation. Gerrard dies, is exiled and Aetherworks comes back. Will I get the 2 energy counters from Gerrard and Aetherworks? Does Aetherworks "see" both itself and Gerrard hit the graveyard?
2) yes. AW gives you the energy counters when everything leaves play, including itself
2. Yes, assuming Gerrard and Aetherworks Marvel aren't tokens. Aetherworks Marvel's first ability will trigger whenever "a permanent you control is put into a graveyard", including Aetherworks Marvel itself or a "permanent you control" that goes to the graveyard at the same time as Aetherworks Marvel. This is because that ability is a leaves-the-battlefield ability that looks at the state of the game just before the trigger event it cares about (C.R. 603.6c, 603.10, 603.10a). See also this thread.
EDIT (Dec. 5): Add assumptions.