Chase cards stay steady
It can accelerate energies via its attack, dish out serious damage as well, and can enable players to pull any two cards they want from their deck at whim
The vast majority of bans in TCGs focus on stopping strategies that dont let opponents feel like they are getting a chance to play (mill, discard, and burn)
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
In a similar vein, Experimental Augury has a similar effect, but is more flexible
Invasion of Segovia is a perfect example: It creates Kraken tokens, so its already synergistic, and it makes fodder for Jalira, but its not a creature card, so this otherwise subpar hit wont ever be the card you find with Jaliras polymorph ability