What are some notable MTG 4-color legendary creatures and their unique abilities?

Some notable MTG 4-color legendary creatures include Yidris, Maelstrom Wielder, Atraxa, Praetors' Voice, and Breya, Etherium Shaper. Yidris has the ability to give spells cascade, Atraxa can proliferate various counters, and Breya can sacrifice artifacts to deal damage or gain life.