Back in September 2019, Japan announced their first rotation for the Regulation Marks
There are a couple different answers to this question, so I'll run through them all
While Bant Counters doesn't seem like the most inspiring of themes, Tidus, Yuna's Guardian provides so much value for three mana that it's hard to ignore, letting you draw cards, move counters around, and even proliferate each turn
Turning all your creatures into an army with a paragraphs worth of abilities is almost always good
Legendary Creature - Human Knight Draw (CTRL to add secondary) Finisher Karlach, Fury of Avernus Whenever you attack, if it's the first combat phase of the turn, untap all attacking creatures
Whether you're tuning a tournament deck or finding the best five card combo for the next Singleton event, Personal Stats is the best deck tracking tool that has ever existed for digital Magic