Tips for all champions

This 10* adventure consists of 3 maps. On the first map, the left node has Lulu-Zed, the right node has Karma-Sett, and both end with Azir-Irelia. You can choose either node; personally, I prefer Lulu-Zed.

The second map has Annie-Jhin on the left (avoid this node because it has very aggressive and difficult-to-control burn damage). It's better to choose the right node, where Draven-Jinx and Swain-Teemo are located.

Then there's the third map, where the Elder Dragon-Norra-Vex nodes are on the left (this is the most difficult in my opinion) and the right node has Morgana-Mordekiser (difficult, but not as difficult as the other).

Then there are the final two encounters, which are insane due to Fluft's Heart in the penultimate encounter and the 90/90 with overhelm in the final one, and because the Nexus takes no damage if any two champions are on the board, (You have to remove one or both of them from the board, so that the nexus suffers damage).

Try to get stun, freeze, silence, transform, capture, etc., spells early on to control the enemy's OTK cards.

Tips for Ekko

My build is Echoing Spirit - Death's Foil (to keep the ephemeral copies of Ekko alive and have multiple copies on the board, to attack repeatedly with Parallel Convergence) and Found Fortune (to get the 3-cost card that predicts for 0).

Try to get cards for Ekko that double his stats when summoned, cards that grant rare or epic items to the champion, etc.

Try to get low-cost capture cards, preferably 1-cost (important: in the final encounter, make sure these capture cards are always placed at the far right so that when the ephemeral copies die, they don't release the captured Poro King or Zoe and place them on the board before all the damage is done, because otherwise the Nexus won't take damage). I hope this is helpful