pokemon cards vstar rainbow rare (You cant use more than 1 VSTAR Power in a game.) VSTAR rule — When your Pokémon VSTAR is Knocked Out Charizard VSTAR (174/172) Secret Rainbow

Based on that, you should start adding cards

You can only activate one per turn

Fevered Visions A Howling Mine effect and a payoff in one, this staple of Shadows over Innistrad Limited seems good in the context of this list

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Its only one precon, but it does come with six different legendary creatures who could work as your commander depending on how you combine them (five of the cards have a special Partner mechanic called Character Select that lets you start with two of them in the command zone instead of just one)