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Those and the illustrator are the front runners

The biggest problem with Sylvan Advocate in this format is that the Bant Company decks are built to beat the card by playing larger creatures, going around it, or using their only removal spell in Dromokas Command

While this will happen incredibly infrequently, you are always guaranteed at least one rare or mythic rare, and 58% of the time, you will get a combination of two or more rares or mythic rares

Gardevoirs ability is that it takes one energy and adds it to the Pokmon in the active slot, on top of the regularly generated energy

These colors all help the strategy quite a bit and have plenty of support cards released for them over the years