If you don't have fourteen or more cards in your graveyard at that time, the ability won't resolve and none of its effects will happen
Do you want to see heroic make a return, and how would you like that done
You can use as many as you want - even all five
Ikoria: Lair of Behemoths Bundle $139.99 Ikoria: Lair of Behemoths Collector Booster Box $799.99 US Shipping Only Due to export restrictions, this item may only be shipped to addresses in the United States, APO/FPO addresses, and Puerto Rico
Getting Moana on a location with another character and a Vault Door in play can deliver a huge pay-off, but if you're letting the opponent run away with the game while you try to set up all of those pieces, it just isn't worth it
Truly an insurmountable control finisher, if built up to, and if you manage 2+ emblems, the game is probably in the bag