So long as you have five mana to spend, you can keep taking extra combat steps that untap all your creatures
Your opponent then blocks with a War Mammoth
The match only came to an end when Chris Claythe former head designer, I believe, of Magic Arena actually banned the player after nearly 2 hours, or 107 minutes to be exact, stating that it was pretty clearly against the terms of service to just keep looping Nexus of Fate forever without being able to win the game
Reflections of Littjara is a useful enchantment you should be running in any Blue tribal deck anyway, just to double up on your creatures
In that case, Veil of Summer completely locks them out from interacting with you and replaces itself
Illustrated by Joshua Raphael Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp