Thalia, Guardian of Thraben increases the cost of non-creature spells, Kira, Great Glass-Spinner protects your creatures, and Shalai, Voice of Plenty gives you, your creatures, and your planeswalkers hexproof
In EDH, Yarok gives you a reason to play good stuff that have good enter triggers, and each new MTG set gives Yarok more toys to play with, seeing as everything has enter triggers these days
Each set normally has between two and four of these, also called Commander 'precons' (short for preconstructed decks)
A board wipe for five mana, Wave of Reckoning makes each creature deal damage to itself equal to its power
it's so shiny in person she owns the gemstone artist niche bought the pokmon card illustrated by land of the lustrous' mangaka Ichikawa
Theres also Tireless Provisioner, which is a three-mana creature that allows you to create a food or treasure token whenever a land enters the battlefield under your control