Unfortunately, Modern Horizons 3 was subject to a series of leaks last month, but instead of simply ignoring them, Wizards of the Coast embraced them and discussed the cards revealed in full to help provide players with some additional context for what to expect
Torchic Gold Star 108/109 from EX Team Rocket Returns, graded 3 by PSA
Generally speaking, most decks are split following the pattern of 15-20 Pokmon/20-30 Trainers/8-12 energies
Ideally, we would remove some of the fringe mechanics like Myriad and Vanishing, but it's good to know what they do, and the cards that utilize them are fairly straightforward
However, every time the player casts a non-creature spell, Vivi gets a +1/+1 counter and deals 1 damage to each opponent
Want to take a look for yourself