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The card quests for one lore, and 'Chart Your Own Course' gives John Resist +1 and an extra lore to quest for - one for each location you have in play

It seems very unlikely that the consistency you lose from playing 20 extra cards will decrease your odds of winning by 10% or more, which would mean even discounting any specific Yorion, Sky Nomad synergy, it would be correct for a lot of decks to add some extra cards to meet the Bird Serpent's companion restriction

Once the required charge counters are met, the Planet can be tapped for other effects aside from mana generation

1 Non-foil Tarkir: Dragonstorm Commander card This can be 1 of 10 mythic rare borderless legendary creatures (11.1%) or 40 extended-art rares (88.9%)