Classic IG? ... below:
Incomplete IG, withstood, then pawned the cosmic scale spatial/temporal nullification energies of the UN.
Incomplete IG, in an instant, merged 616 with a duplicate 616, from over 100 universeS away.
Incomplete IG was involved in blowing up the Multiverse in Infinity War, then remade it in a snap.
Complete IG made Thanos "supreme" of all universeS. (on panel he visited other timelines)
Thanos let off a blast once that went past 616, past the Multiverse, and kept wrecking reality even into the Beyond Realm.
Warlock was able to give the LT a fight, ... while the LT was "representing the forces" of TOAA.