Garna, the Bloodflame has an ETB (enter the battlefield) effect that states that I may "return to your hand all creature cards in your graveyard that were put there from anywhere this turn".
There was a ruling in 2018 that states "Which creature cards to return to your hand is determined as Garna's triggered ability resolves. If Garna somehow finds its way into your graveyard before that, perhaps due to the "legend rule", it will be returned to your hand."
I would like to cast Garna and then immediately sacrifice him before his ETB resolves. I built a deck with multiple cards that can sacrifice creatures including: enchantments (e.g. Goblin Bombardment), Planewalkers (e.g. Vivien on the Hunt), Creatures (e.g. Thermopod), Sorceries (e.g. Life's Legacy), and Instants (e.g. Fling).
I thought that I may cast instants or trigger activated abilities on permanents already on the field immediately when Garna enters the field. As the top of the stack triggers first, they could move him to the graveyard before his ability resolves. My group (which includes all the individuals who taught me this game and the only people I've ever played with) ruled that the ETB would trigger immediately upon entering the field and the "legends rule" is a very specific case which would trigger before the ETB. They said something about activated abilities resolve at sorcery speed as opposed to instant speed but I didn't understand.
While I was more that willing to concede that point for the match, I really would prefer to understand how this mechanic actually works as it seems fundamental:
- Could I cast an instant immediately after casting Garna to sacrifice him before his ETB triggers?
- Could I activate an ability on a permanent already on the field to do that?
- Planeswalker ability?