Borderless Frame Break You can also find borderless frame break cards in Modern Horizons 3 Play Boosters and Collector Boosters, with 30 in total across the set (26 rares and 4 mythic rares)
Regenerating a creature can be gamesaving against removal, and preventing combat damage is excellent when you're facing aggressive strategies
A useful deck might actually be red-blue and merely splash white for Gandalf the White, and add Isochron Scepter to round things out
For example, if you control The Ozolith ("Whenever a creature you control leaves the battlefield, if it had counters on it, put those counters on The Ozolith.") when Zack Fair's last ability resolves, you'll put the appropriate number of each kind of counter onto both The Ozolith and the target creature
You generally want to play other anthems that boost those abilities, which also arent exactly cheap: Coat of Arms and Door of Destinies are both upwards of $15, and Urza's Incubator goes for over $10+