You can pick your own adventure here, shifting around lore counters on sagas, messing with +1/+1 counters on amass creatures, or even tinkering with planeswalker loyalty counters
Of the black legendaries in the set, I really love Shadowheart, Dark Justiciar, who is an excellent Commander and card in the 99 of decks with big creatures
In Limited, thoughwhere power levels are lower, and where all decks play with a healthy number of creaturesboard sweepers are typically bombs
Strategy wise, you can put Vanillite into the active Pokemon spot whenever you get it in your hand, but the sooner in the game you get it into the active Pokemon spot the better, you can then attack and evolve into Vanilluxe in a few turns, depending on how many energy cards you have on Vanilluxe and the time in the game will determine which move you should use
That will be measured by what you get back