Well start by upping our token game even more, with Ojer Taq, Deepest FoundationOjer Taq, Deepest Foundation, who triples our creature tokens
Terra, Cloud, and Tidus are the clear picks for their games, but how did you land on Yshtola for Final Fantasy 14
Well also add a little card draw and a few efficient counterspells to protect our growing army from sweepers or other bad stuff, and then its time for some fun splashy purchases
He protects himself with a fairly steep ward cost, forcing your opponents to sacrifice a creature if they want to target him with a spell or ability
One of the most infamous examples of how overleveling can backfire is leveling too high in Chapter 1 will make random encounters in Chapter 2, when Red Chocobos start appearing, absolutely brutal (Red Chocobos, appearing once high enough level, can repeatedly use Chocobo Meteor with no cost nor charge time)