If we want to keep our Blue decks low to the ground while still seeing lots of cards, the Ponder/Preordain combo should be present
(Treat it and anything attached to it as though they don't exist until its controller's next turn.) 10: Take two extra turns after this one
Some popular inclusions in a Gishath, Sun's Avatar Deck might be: Regisaur Alpha Ghalta, Primal Hunger Temple Altisaur Zetalpa, Primal Dawn Etali, Primal Storm 14 Jodah, the Unifier ($2.40 Market Price on TCGPlayer) Cascade Into An Endless Flow of Legendary Permanents As a 5/5 creature for 5 mana cost, Jodah, the Unifier's stats aren't as bad as others on this list, but they're largely irrelevant for his strategy
And, because of this abhorrent marriage of card types and mechanics, there are so many ways to squeeze more value out of this than just drawing two cards or having a mini-annihilator in play