The ShiftstonedEternal Power Calculator is a deck-building tool that visualizes your odds of drawing enough Influence and Power based specifically on the cards found in your deck.
Let's say your opponent plays a Harsh Rule and you had Dawnwalker in play. You can play Xumucan at the end of the turn as an Ambush and get back Dawnwalker and then attack for 11 on the next turn. It works even if there isn't a Harsh Rule, as long as Dawnwalker is in the void then you have access to 11 surprise damage
Oh ok, for the ambush effect, I was still stupidity thinking about having 2 obelisk on the board, and make Dawnwalker return thanks to the explorers 😅 Thanks for the answer!!